This Reproduction Of A Rare Holley Carb Is Chock Full Of Issues. Here's What We Found And The Fixes
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- Опубліковано 16 вер 2024
- Yesterday we dropped by Kiwi's to check out a beautiful but foul running 427 AC Cobra replica. We pulled one of the carbs that was apparently dumping fuel and tore it apart only to discover a multitude of problems and a unique casting defect we've never encountered before.
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I am always impressed with UTG's detective work on engines and engine components. So much knowledge being shared on this channel. Love it!
We need more content like this! There's not many true carburetor gurus left.
Shall ain't...
Try being a Crossfire Injection guru. I’m known as a god to many and have helped dozens of people with a fuel injection system that was rendered obsolete almost 40 years ago.
@@Joesmusclecargarage Yet in your recent video you declared, "I don't make these videos to...come across as an expert or...a know-it-all." No, just a god and a guru! As I said on your page, I hoping you can correct this in yourself. It will make you a better person for it.
@@kozak65 The terms “god” and “guru” were used by others in the thirdgen F-body and CFI community when referring to me. I’ve owned and have done more show quality restorations on musclecar era Mopars and GMs than most people can only dream of. I know what I know, and have the skills that I have. If the above exceeds what somebody else has to offer, I don’t have any control over that. Capisce?
@@Joesmusclecargarage Thou art thy crossfire injection Lord and thy Savior, and thou who shalt denieth shalt be cast into the lake of carburetor darkness, amen.
You may be right trusting a hydraulic jack 99 out of 100 time, but that 1 time will bite you in the a55. It's just poor safety habbits on your part, it's one thing for yourself all together different if you put someone elses safety at risk.
You are so right. Also young people watch this channel and may think thats OK. You know and I know if that car came down on it's suspension it would hurt!
Also Uncle Tony is a hypocrite. Six months ago he had a video about the 1300 Horsepower Mercury Crash and that it was the most ignorant and negligent thing he's ever seen done with a car. I guess if that hydraulic jack failed, then it would be the second most ignorant and negligent thing he's ever seen done with a car.
@@GreenPatriot2024 UTG could have quickly and easily demonstrated his beliefs to prove he was correct or not. Always at least throw a wooden block under there. Takes 30 seconds.
Hi Tony
I have been restoring carburetors to factory specs for close to 40 years. The problem with the Holley carburetor is the the body warps in different direction than the metering block. When that happens you will pull fuel into the PV vacuum chamber and right in the engine. Unmetered fuel. The accelerator pump feed is one big area. I mill all these surfaces and when you run the mill over these surfaces you will see how bad they are. You definitely have a casting problem on that surface. I also straighten the metering block. Also you will see the new style metering blocks have reinforcements cast into the metering block to help with the warp problem. I can take a new Holley out of the box and make it run better just by surfacing it. Also the gasket material is hard as a brick these days. I soak the metering block to body gasket in berrymans carb cleaner for about 5 minutes before assembly to soften them up. You have to keep an eye on them as not to turn it to jelly. Then rinse it well to remove the chemical. I have a UA-cam channel name is Harold Demes that shows the problems and process to fix these issues.
I've found BAD warping with many of the endura shine or whatever that crap is Holley is sticking on there that mimicks a chrome finish..... LOL ..... has even flaked off at times. Steer clear of those.
Hi Harold, after your reply I went to your channel, an absolute wealth of knowledge, you have helped explain those mysteries I have been struggling with, and good old utg was the culprit to getting me to view your channel. thanks both of you from au.
The carburetor never had that surface milled flat. That line isn’t necessarily a defect in the casting but left over from the casting process. Before locomotives I worked as a cabinetmaker and pattern maker. Any surface that is specked being flat but have a parting line MUST be milled flat. That is a process defect and is inexcusable. The assembler should have caught that casting issue and sent it back to the mill room.
Good eye UT.
Greetings from the high plains of Texas.
Exactly! But why would they design a mold with a parting line in the middle of a surface that must be flat?
@@robertwest3093 ...cheapnieseum
None were ever milled flat. (not saying they shouldn't have, but they usually didn't need it till the chinesium castings)
@@robertwest3093 may have been designed by Hu Flung Dung.
@@robertwest3093
It’s not unusual to have parting lines on surfaces that are intended to be milled flat. It is a very faint parting line and should need very little of the surface taken off. To make that part without the parting line running through the gasket surface would require a more complex mold. It could be done but would be more expensive and not last as long.
I spent some time teaching electricians and maintenance technicians in a few local foundries and factories as well as troubleshooting a few CNC mills. That ridge and offset is typical of castings, but the manufacturer should have ran it through a mill and flattened it before shipping it. Its a great work around to use a file to mill it flat yourself, but it reflects badly on the manufacturers quality control. Some machinists talked about their training involving hand machining with a file that some companies required before running an actual hundred thousand to multi million dollar mill. Awesome video Uncle Tony, you are an ,electrician, machinist, welder, plumber, all the things that make a great mechanic!
My favorite aids for filing flat is a giant fat blue magic marker - AND I have a 10" by 14" piece of hard tool steel that was ground OMG flat. I've had glass windshields that were as flat but they were too smooth to remove the MM at the (always) three points of contact.
Well said.
Not sure of your age Circuit Secrets, but back in the day I remember all of my school friends priding themselves at the ability to repair all sorts of things, plumbing, electrical and engines. I wonder what will become of the younger generations as this type of mindset and critical thinking seems to becoming a rarity.
Love UTG's content.
Common tony that car was heavy if it fell and compressed the suspension it would give you a slam, if you fit so easy you wouldn't have needed a jack.... Common you salty ol bird Just say yeah yeahhh it was wrong I shoulda grabbed a jack stand or tossed a tire under it, your a role model doing dangerous stuff sets a bad example especially to youngsters... Most anyway arent not picking we all love our uncle Tony! And no one wants to see ol UT get killed in the parking lot... My kid say hey look no jack stand because I pound that rule into his head to NEVER EVER use just a jack if your going under at all and he has a Tahoe not a 4200lb low slung car. We went worried per SE because I guess the thumbnail woulda said "burnout goes horribly wrong and I mean HORRIBLE!"
It also looks like there's a shiny witness mark on the screw boss in the power valve hole of the main body from where the double gasketed power valve was sticking into it deeper than normal. That also could've held the metering block sightly askew, which would also account for the accelerator passage leaking in that area.
Should have used 3 gaskets. (Joking)
I think you're spot on with this diagnosis. I'm not discounting Tony's discovery of a casting flaw, but that extra gasket could cause this exact issue if the power valve is, in fact, contacting the main body of the carburetor.
Good catch, that was the first thing I'd seen being I seen this before on carbs. with after market no name power valves of in correct gasket(s) also need to check clearance after resurfacing.
Good catch, that's exactly what I suspected when Tony showed the double gaskets.
Yep, spot on. Looks like just from this video that there are several issues with prior repairs on this carb. Add them all up, and you have a basic garden hose dumping fuel into the engine, instead of a metering device controlling it. I'm sure UT will go through all of it, and build it right again. Who knows what else there is to discover yet.
Honestly Tony I'm glad to hear you got alot of Flack for Not using a jack stand. You gotta remember were in the 21 century and Common Sense has left the Country. You must remember, with you doing this Great Channel, you are considered a LEADER. Lord knows this Country needs more Good Leaders and You
DO fit that roll. So with a World full of Followers, they only do what you show them. If it's OK for Tony to get under a car without a jack stand, I can too. To your followers, they wont think about whether the tires on it or not. Please keep your Followers safe and stress to NEVER TRUST HYDRAULICS!!!!! Just be Pro Active and Use the jack stands. It only takes a few extra minutes to keep yourself safe and just a second to Have A Bad Day. Just my 2 cents worth.
Keep up the good work.
Safety first please.
Thank you for the nice words, and you DO have a valid point. But, there has to be some level of reason and common sense when doing generally routine and non threatening things with a car.
I found it a little irritating that a guy whose entire shtick centers around being critical of others couldn't/wouldn't accept a little constructive criticism himself.
0:56 I knew he would get hammered on that
It was pretty irresponsible of him to do that. He has nearly 300k subs and I'm guessing at least several thousand of them don't understand the dangers of not properly supporting the car. They'll see Tony do it and think it's OK to do themselves without fully realizing and assessing the risk they are taking.
I was an automotive guy way back and a shop close to ours had a jack slip and the car fell and crushed the man to death. I didn't make any comment but I understand those that did. Think of it this way....the car & jack are a gun....even if the gun isn't loaded, you ALWAYS treat it like it is loaded....which means even though UT was correct and the wheel never left the ground, a jack stand or second support should have been used. The craziest thing would be the jack failed catastrophically AND the wheel spindle breaking (about ten gazillion to one odds) but IF it happened, that second support would GUARANTEE the mechanic would be safe. Best insurance in the world is a second support (jack + jack stand) and it's the proper example to set for non-professionals and newbies.
UT, I'd dare bet those jets were changed to a smaller dimension as well. In a feeble attempt to make up for the over-fueling. Jmo. Good vid sir!
I guarantee that's not the only one that came off to production i'm like that probably hundreds of them great stuff TONY GODSPEED
1985 I was putting a hurst shifter in my car replace the column shift. Front tires on ramps. Zero wheel chocks. 15 year old rookie mistake. Headers and motor still blazing hot. Layed under car. Removed hard linkage from side of trans. Slapped rachet on nut in U shaped gear selector. Click, click, click neutral. Ohhhh shit. Car rolled down ramps in neutral. Only thing that saved my life was my head fitting in back of front tire in wheel well between tire and frame. My arm was trapped between ground and header. skin burned off. and my rib cage as a wheel chock at the bottom of the ramp. 48 years later I've done dozens of motors, trans, chassis work. But i don't work under any vehicle that's not 150% supported. Even if doing a quick job. Most dangerous people are newbies and experts. Stay in the middle. Educated but not over lax
I think the power valve block off valve is hitting the carb body, look at the shiney spot where it looks like it was touching, the new power valve looks much smaller and thinner
Thanks Big T. ..
Awesome troubleshooting !! Love it
The power valve gasket may have been a thicker one that just tore in half, and looked like two of them, I had seen that before.
Yes, I have seen that as-well. i think that's whats going on there
Tony, it seems you produced a video sometime back about "new" parts, as I remember you used ignition points as a example, this is by far the most perfect example! Thanks for your time!
Tony I've been finding a rash of power valve gaskets that appear to be 'doubled up'. Where in fact Holley is using these as a stand in for their thick PV gaskets and they de-laminate after installation. Even finding these same PV gaskets in some of the Holley rebuild kits. The gaskets appear to be 1 pc when they are new, but install one then run it for a year or so, then take the PV out and it will do this very thing. This has been a noticeable issue in the last 6-8 years.
That 'could' be an overseas copy. ANY real Holley, factory Ford or any other make (MANY used by Chrysler too), will have Ford's part number(if for Ford), Holley's list number, and the DATE CODE. If no date code, definitely a repop.
A typical 4160 model 650 cfm has # 64- 66 pri jets in it. I have a few 390 cfm Holleys that are using as small as 51-52 jets. So couldn't imagine this thing running with that or less.
Now it's possible that these carbs mimic the '66 289 Dual Quad carbs. I can't see the Numbers on the Air horn so I can't tell. But the throttle bores on those are certainly smaller.
The 289 Dual Quads were:
Hol# R3360A or R3361A Ford# C6OA-9510-A or B and rated at 450 cfm each.
The 427 Dual Quads were:
Hol# R2804A or R2805A Ford# C3AE-9510-BJ or BK and rated at 600 cfm each. 1963.5-1965 406-427 & 1967 428 Shelby GT500 (also Ford#C4AZ-9510-A )
Hol# R2926A or R2927A Ford# C4AF-9510-CU or CV and rated at 715 cfm each. 1964-65 427
Hol# R3300A or R3301A Ford# C5AF-9510-BC or BD and rated at 710 cfm each. 1965-67 427
Hol# R3410A or R3411A Ford# C5AF-9510-BU or BT and rated at 785 cfm each. 1965 427 SOHC
Hol# R4201A or R4202A Ford# C8OF-9510-AC or AD and rated at 652 cfm each. 1968 427 (Drag Program)
There's a couple other sets used as well, but they were de-choked and ran as matches. These here are the most common Pri/Sec sets with chokes.
If it IS in fact the smaller 289 carbs, a good baseline would be a #58 Jet, .025 squirter, and either a 6.5 or 8.5 PV. Gonna be a STRONG vac signal with those on a BB 427 unless the cam is eating it up. If its the larger 700+ cfm ones, you would be correct, the jetting is right around #70 -ish... with a .031 -.035 squirter and probably a 6.5 or less PV.
I'm sure you're done with this thing by now, but hey... brainless info to pass on to whomever would like it.
I picked up many Holley carbs thru the years with casting flaws. They could be corrected but enough to cause vacuum and fuel leaks. My favorite is an old school 750cfm double pumper. It's previous owner bought it new but couldn't fix a fuel starvation problem. Casting flaws from the throttle body to main body caused little air leaks. It looked brand new still, one gasket and a little file time resulted in a great carb. New in the 90s, I paid like $50 bucks. It is presently on a 1970 340 Dodge and runs perfect!
Tony you are wrong about the jack thing. If a hydraulic jack suddenly fails, the car will drop, but because of the weight of the car, it will bounce on the suspension. Meaning it will first drop lower than normal ride height before bouncing back up. I am also guilty of crawling at least partly under a car supported only by a floor jack. I did it for decades when changing oil. A couple years ago, while I had the oil drain pan under the car, which fits without the car being on a jack, I decided to let the car down so more oil could drain out, because of the location of the drain plug, and because I was doing the job on an inclined driveway. I twisted the handle, intending to let the jack down slowly, but turned it too fast and completely released it. The car dropped and bounced, and the oil pan on the engine hit the drain pan full of oil, partly smashing it, and making a real mess. Oil all over the place. Fortunately I had a Walmart plastic tarp on the driveway, and nobody was under the car. Now that was a 2 ton car, a super lightweight car with no engine or trans might not bounce as much.
It's nice to know there is somebody still around (besides myself) that knows about carburetors. I can guarantee that carburetor was made in China. They are well known for not only making fake parts, but putting actual brand names, model names, and serial numbers on them. It may not work no matter what you do to it. Most Chinese made products copy the basic design, but not the actual specs. A few years ago I was rebuilding the top end on a Lifan (Chinese) Yamaha Virago/V-Star 250 engine. I broke one of the new rings. It took forever to get those parts from China, so I bought a genuine Yamaha ring. It wouldn't fit. It was way too thick. Almost twice as thick as the Lifan ring. Looking at them very carefully, I found a couple of other differences with them as well.
It's very possible that whoever was working on that carburetor before did not realize it was different from a real Holley, and would not work the same. They were probably trying to rig something to fix a problem, and created another problem. There is a good chance that even if you get everything to where you think it is right, it still won't work properly. It might be drivable, but considering what kind of car that is, the owner probably wants a bit more than that. I seriously doubt that dual quad setup was on there just for looks.
Thanks Tony , I found Harolds comment and thanks to both of you a lot of mysteries are uncovered, have struggled with settings for years, now the penny has dropped. Thanks from Australia.
OMG ,What do you mean you wont be around for the weekend? You cant leave us alone! "That's a lot of sarcasm right there." Great vids & have a great weekend.
1- we love you and don't want you to get hurt , 2- damn, that's a broken skirt and 3- good detective work.
As to jack stands. @Uncle Tony let me tell you a story. I was home alone doing a brake job on my wife'nissan sentra, circa 1998ish. Wife had infant daughter over at my mom's house about 7 blocks away. I had finished and was taking g car down off the jack stands using the only jack I owned at the time, a scissor jack. I had pulled one out and was reaching across to take out driver's side jack stand. About that time, the car decided to shift and the jack fell over, dropping the car on top of me. To this day I have trouble with both shoulders.
I can't wait for the episode where Kiwi steals his wingnuts back 😆
My father drove Common sense in my head when I was a kid That's all you have to do you're so right tony God speed
When I watched the video at Kiwi's my first thought was power valve. When I rebuilt the Holley on Dad's 50' F-1 I had a very similar problem. Fuel pouring into the intake from the new power valve that wouldn't seal, but it's bewildering at first because it's on the underside of the carb. Found a small retailer out of Florida who turns the chinesium replacement power valves on a lathe so they seal properly. I bought a spare. Worth every penny.
An asteroid comes outta nowhere and hits the jack- lmao!!!🤣
Best practice when fixing a problem is exactly this one fix at a time
YOU pointed this out a couple of years ago,as a warpage of heat cycles.there's a difference between replaceing parts and knowing how stuff works. learned the hard a on a 1150 boat carb several years ago.yup a file file would have saved $550.my father and the rest of the grease monkeys told me to go into another trade.still like getting old crap going.watching you ,andy and dv,love it.kiss.
They more than likely put smaller jets in there to help lean out the problem they were having. I would get back on that forum and see what others are running along with the exact power valve, it sure would save a mess on the engine changing them later.
I remember the amazing sound the thermoquad 4v carb made when i stomped the pedal to the floor on my first Dodge project, it was a 73 charger i bought for around 600$ when i was 19yrs old, the original engine was in thousands of pieces (with several missing of course) so i went on the hunt for a donor engine, several people said that if i was looking for Dodge parts i should "go talk to the Mopar man", he was an older gentleman that lived a little ways out in the sticks but he was definitely a "Mopar Man", turns out i was given good info because he had at least 40 old Mopar vehicles sitting around his property (most of which were "not for sale") we weaved through rows of so many amazing old cars, Challengers, Road runners, Chargers (even a Cuda or two) until we ended up standing in front of a huge boat of a car from the early 70s, he said "It has a good 400 big block, I'll take 300$ cash for it today and today only, so take it or leave it", i didn't know much about Dodge engines but i knew that a 400 was a lot bigger than the 318 that came with my Charger, it was complete from oil pan to air cleaner and guaranteed to run so i said "Sold!" Friday finally came so we grabbed a couple of 30 pcks of Natural light and got to wrenching, we had the 400 pulled and ready to be installed before the weekend was up and had it installed by the end of the next weekend. It had the strangest looking carb i had ever seen, it was plastic in the middle (which i thought was odd af) but until i could afford to buy a new Holley i was stuck with this strange looking thing! We primed the carb and to my amazement it fired right up when i hit the key! After a minor adjustment to the timing and a few other minor things like adding antifreeze and transmission fluid it was running like a sewing machine! I couldn't wait to get it out on the road and see what it would do. A younger neighborhood kid had been watching us work on the old Charger for the past couple of weekends so when he asked if he could go along for the test ride i told him to hop on in the back. We began by driving slowly down side roads but after a few min we got to the two lane blacktop that divides our small town down the middle, i pulled onto the blacktop road and came to a stop, thats when i decided it was time to "see how it runs" and everyone knows the best way to test out a car/engine you know nothing about is to just "stomp the gas pedal to the floor like you are kick starting a Kawasaki" so that's what i did! It wasn't the fastest car I'd driven but you could hear that carb humming for at least 3 block's as it roasted both of the super wide (super dry rotted Hercules brand tires) rear tires off until it finally got traction and we took off! We were all laughing hysterically like young dudes do when they are doing something dumb but we weren't laughing for long......On this two lane blacktop there is a sharp S curve (speed limit of 25mph) and we were rapidly approaching that curve going no less than 90mph! At that point i was satisfied that id scared my passengers enough for one day so i let off the gas.......I took my foot off the gas pedal and immediately got on the brake's, at about the same time the brake pedal hit the floor (with zero resistance) it occurred to me that although i had let off the gas pedal i could still hear that amazing hum that comes from a 4v carb when its at full throttle! Yep, the throttle was stuck wide open and the brakes were gone, my cousin (who was in the front passenger seat) was staring at me with his eyes as big as pie pans probably wondering wtf i was doing as the poor neighbor kid in the back screamed in terror while looking like a cat stuck in a tree during a thunderstorm! Lucky for me (all of us) i was taught that if i was ever in that situation all i had to do was turn the key back one click (2 click's can lock the steering) on the ignition to kill the ignition so that's exactly what i did! We still coasted through the S curve at about 50mph but we lived to talk about it lol its funny now but when i change an engine im always sure to work the linkage and make sure the are no kinks or catches! 😂😂😂😂😂😂😂😂
I used to do brake jobs and other work on my friends 76 New Yorker on two Bumper jacks in his a gravel driveway, now that's living on the edge
Real world stuff Tony. Thank you for thinking about more than just entertainment value.
DANGEROUS!!!
You forgot to put a Jack Stand under the Carburetor,you might break your hand if you drop it..Safety First Remember!
*Just looking out for you!
You won the internet for today!
I'll see you in a bit!!!
Dude, I am on the edge of my seat now. You have to show us what that looks like after you file it down! "put it in your lap and file it" !?!? You are awesome!
Kiwi called he wants his Wing nuts back!
7:15 those power valves gaskets split in 2 when you remove the power valves. Happened to me on my 780 Holley the other day and I’ve had my car since 1981 and have serviced the Holley many many times.
I spent 5 hrs today filing my warped Holley parts.
Hi Tony, my name is Dennis. I've been a tool and die maker, for 45 yrs. In so far as using a file, on the Holley carb. A file is not flat. One side is convex, the other concave. Check it with your straight-edge. I would not do that. Or I would be extremely careful.... could make the surface out of flat. I am 65 yrs old. Been into mopars, and worked on cars, and hotrods since I was a youngin'. No disrespect, in anyway! A lot of people think a file is dead flat....none of them are.
great info! Thanks Tony!
What you’re seeing with the power valve gasket is actually the gasket splitting in half, which is super common when you go to take one out. They almost always split clean in half like that. It being wet between the two halves tells me someone had taken the PV blank out at some point, split the gasket doing so, and then slammed it back together anyways, or they reused the already split gasket installing the blank in the first place
I said it once. I will say it again. You are one of the best. I can't ever find any faults with your skills and knowledge. I have been a tech for a very long time it seems and I have a rich background. I truly enjoy watching your channel! We are the last of a dying breed. Male humans who rip on you have soft hands and sons who question their gender. God Bless!
It is called 545cfm for the 2x4 427 LR. Another Pony Carburetor fuckup.
Seeing the headline triggered a loud "Yep!" in my head. I worked on a Falcon last year that had an eBay "Holley" called a Rallye, or some such. The car would not start and remain idling. The old Motorcraft 'Rebuilt by Holley' carburetor the customer had as a spare had the car running great. The next day, the customer sent a note to say he got the car to run on the eBay carburetor by turning the idle screw fully inward. Good for him.
I have found some Holleys thottle Bodys that were not flat where the metering plate bolts on, and had a mystery leak over night ! It would run fine on first start up on the engine stand, in the morning it had flooded the engine !
I totally enjoy carburetor episodes!
Your the cats meow! I got a red xj 2 door I Wana hit 300,000 miles with, have 211,000 now, so in another 10 years I will hit the milestone. Keep up the excellent work Tony.
Holy crap look at the threads on that power valve blank 😂
This is the only chanel I whach everyday. And I don't even have a Mopar I'm a heavy duty macanic but still love the chance good job guys
I rebuilt my mates 570 street avenger and had that exact same casting line.
3 hours with an oil stone to get both sides right.
Should have used the file to speed things up and finished it off with the stone
I've had those new shiny silver coated with who knows what holleys start flaking on the inside causing problems so I swapped bowls to get a old caddy running
Great Detective work bro.! ... Most times that's what it takes.
I believe if someone wants to jack a car up and crawl under it, just be sure they know it's dangerous, and leave them to it, I was swapping transmissions, and the wind blew, the car was on blocks, I was on my knees, about to crawl under it when it fell , no jack under it, from then on, I shake the car, before getting under it, if it has any wiggle, I'm not getting under it!
haha on the comments...while I was watching I saw/heard those two things yesterday and thought the trolls would be out for sure.
Tony, your production speaks for itself!
This is actual hot-rodding people!
Can I make a suggestion?
When you are doing something such as taking a carburetor apart to diagnose or rebuild it. Could you set up a camera on the bench and do a time lapse so we can see what's going on? Maybe put out a short time lapse video of a carb rebuild, or cylinder head rebuild, or whatever on occasion? I love listening to you explain things, but it would also be fun to watch you in mechanic mode just doing something like that. You wouldn't even have to get out of mechanic mode to get into video mode. You could do a follow up explanation video afterwards if there's something you want to show us.
I'm sure a lot of your viewers would watch them. And maybe even get some new viewers.
Just a thought. Thanks as always
,,,,,,,,,,,,,thanks T,,,,,,,,,I'm a carb guy since my mini bike days as a teen,,,,,,,Thanks for the info....................
Lol. On the last episode, I thought Uncle Tony was getting in the car w/o any windows to go home. Was suprized to see him get in the nice jeep. Lol
When you milled the casting default on the main body you should not touch at all or milled the fuel accelerator pump hole located in the higher place of the vacuum chamber because this hole is higher then the main body surface ! This higher height help creating a more sealing contact with the metering block gasket and the metering block because the gasket sealing pressure is tighter there and prevent fuel to be sucked in the vacuum chamber
I’m not disappointed at how the Jeep runs. I’m disappointed that Uncle Tony is partly just a UA-cam character and doesn’t actually drive carbureted classic Mopars all day, and just drives an EFI turd like the rest of us that gave up lol
Agree, those jets are likely way too small.
It's amazing what people will do. Trying to pass stuff off and something else. Looking forward to the next one 👍👍🙂🇨🇦
I think what people are trying to say about the floor jack is that you didn’t use a Jack stand and didn’t explain the danger to those who don’t know what can happen. Like it or not, some people who watch the channel might not be very experienced with working on cars…safety is important UT
Great video, as a 427 guy, I can assure you, original 2x4 were 550,s. So that carb looks correct. I don't know of anyone that makes that carb aftermarket.
The Chinese tribute to Holley.
Exactly what I was thinking. You can have them make toothpicks, and rest assured it will be screwed up and probably contain lead.
47 years in the foundry industry tells me that's a "shift" where the cope and drag flask pins and bushings are worn. That's why so many companies are reshoring production. A quality issue from [wherever] can have three months of defective parts in the pipeline.
This is great.
Very interesting. Can't wait to see what this carburetor is going to do. Thumbs up!
WOWZEZ!!!
MAJOR CAST FLASH!!!
SUPER WAY SEVERE HELLA BAD!!!
Good detective work I am sure with your experience you had a good idea what the issue was at Kiwi's shop. Had a warped main body on a Holley years ago exact same symptoms and black smoke out the exhaust due to all the raw fuel in the combustion chamber. Used a fine machinist file and draw filed it across the surface. Another typical issue I had with older Holleys is the throttle shaft bushings. Great content and good information.
Uncle Tony, there looks like a raised section, choke side bottom, as well.
Holy cow man . I didn’t know there were copies of those. 🤦♂️
Great video! Thank you for the comprehensive video on trouble-shooting the carb issue.
I spent an hr on each side of my Holley List 4555 780 cfm body with a machinist file and oil to make mine straighter. 😊 My guess on those primary jets for the 427 Cobra would be 68’s. 72’s would be fat and come std in a 3310 prim side. I’m running with 68’s prim and stock 76’s in the secondaries on my 70 Z/28 4-spd.😊 I’ve dropped my cr to 10.2 from the stock 11:1 plus after losing 2 solid lifter cams using the best oils with ZDDP, I decided to go with a roller cam. And I still use oil with zinc in it. To be safe you need a minimum of 1200 ppm of ZDDP to protect a FT engine. I’m just playing it safe since my rebuild in 2012.
Good job! My thought was that there might be a leak in the power valve channel. I’m glad to see that it was. It’s funny, but I doubt myself, probably too much, but my friends always ask me carb questions. I always try to give my best advice, and always ask if it worked. As long as I can remember, I’ve always checked for warped main bodies and metering plates. I’ve seen so many wet gaskets in those areas. The newer Holleys with the brass transfer tubes are even more susceptible to leaks. Thanks for sharing this
Feel it? Heck, I can see the shadow from the cliff on the casting!!
Next week, Uncle Tony is gonna roll up in a DeLorean.
Maybe you can get a thee d printer and use bronze or graphite fill filament and print your own carburetor?
Nice detective work, on every aspect. This is the stuff we minions lack. Great work.
I must add though, that I've only ever had 2 cars with Holley carbs. First a '64 Aussie Valiant 225 with the single barrel, and a '75 360 with the factory 2 barrel. Neither of which are remotely related to this 🤣
Nice find 👍 and be careful 😂
They just can't resist stirring up the "cow pies!"
They make a kit to eliminate the power valve blow out problem. The newer ones come already corrected.
Use jackstands!
Great lesson for me to learn !
I appreciate the video to my untrained eye in knowing what to look for on carb problems!
Thanks Uncle Tony !
Like the tri five Canadian project!😂
I agree no danger, but jack stands are a must in any other case. I worked with a guy who walked on crutches all the time. He told me he had a jack collapse doing a cv shaft job. Broke both his legs to the point where when he walked they looked as though they were broken backwards and no knees. He is still the same way 15yrs later.
Lap vice, eyecrometer and a hand mill.
I had a 68 Shelby GT 500 with a dealer installed 427 side oiler lemans engine I ran 72s on the front bowls of the Holley on it.
It is not to power valve gaskets it is one that split perfectly in half I've heard about this on other UA-cam channels
Neither the jack issue nor the engine knock made me bat an eyelash. Kiwi putting tools right on the kit cobra’s painted fender did raise an eyebrow however. That kinda surprised me.
Would those smaller jets have any correlation with the smaller throttle bores on this casting?
....and the leaking fuel from hell??
Last year I had two different customers, both with Corvettes, that came in with driveability issues. Both had their factory Holleys, both had been sent to Holley to get "professionally" rebuilt. Both cars had the same issue. They were dripping from the secondaries and they both had double gasketed power valves, one had a screw broken off that holds the float in. Sent to the original manufacturer for a rebuild, both needed gone through because they didn't run right.
I have a holley 855cfm vacuum secondary carb for sale right now. It is an OTC factory replacement for the '68 corvette 427 4spd. It needs a rebuild but it's the real deal.
Indeed, it's perfectly safe when all the jack is doing is moving it on the suspension and the wheels are on. I've done that many many times. The biggest risk is being uncomfortable unless the car is lowered or the ground isn't flat or something along those lines.
Amazing what Passes a "Quality " check for acceptable. SMH It's always something though so just another day at the shop 😎😎😎 Great stuff UncleTony.
common sense has left the chat.
Interesting casting flaw. Been many years since I worked on a Holley but back in the day I did have to a lot of "leveling" work with a file.
Yes, it's heartbreaking
Wow, that casting is REALLY rough..... Update: Yep, the file thing is exactly what I used to do.....😊😊
File. Definitely. Also, always check the file for straightness. Most new files, even the best names, seem to come warped nowadays.
@@sometimesleela5947 I still have some files from back in the old days...lol...when they were made with pride in America...so that isn't a problem
I bought a large assortment of Nicholson, USA-made files mid-1990's from Grainger. Every last one of them distorted. The handful I have from the 1960's are all true to a couple thousandths end to end. Sloppy QC on the heat treat, I guess. Sad; I really expect better from products made domestically