Building the World's First Carbureted GenV LT1 Stroker Engine (We Think!) with Gibbons Motorsports
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- Опубліковано 1 чер 2024
- Thanks to Bespoke Post for sponsoring this video! Head to bspk.me/horsepower20 and use code HORSEPOWER20 to learn more and get 20% off your first box.
Engine builder: Gibbons Motorsports -- / gibbonsmotorsportssouth
We've searched and cannot find anyone who has ever built a carbureted GenV Chevrolet LT1 stroker. Maybe because it's a lot easier said than done. The LT1 has been around in Corvettes, Camaros and other cars since 2014, but it is also a completely modern motor built around gasoline direct injection technology. Putting a carburetor on this bad boy to make more power than stock required engine builder Gibbons Motorsports to pull out their entire bag of tricks.
Just a few important links (Please note, The Horsepower Monster may receive compensation from purchases made from these links. So thanks for your help!)
Engine Builder: Gibbons Motorsports -- / gibbonsmotorsportssouth
ICT Billet LS Coil Bracket: amzn.to/3r8XPxs
Manley 20cc Dished LT1 Pistons: amzn.to/3v3FOTz
ICT Billet Valley Cover (fuel pump delete): amzn.to/38bvf7W
ICT Billet Vacuum Pump Cover: amzn.to/3K63zyO
Head Gaskets: amzn.to/3MpIPDt
ARP Head Bolt Kit: amzn.to/3rI1EtR
ICT Billet Fuel Rail Plates: amzn.to/3ExYWwh
ICT Billet Intake Manifold Adaptor: amzn.to/36AHb2T
Holley Retro-Fit Oil Pan: amzn.to/36Ba0vX
MSD LS Coils - amzn.to/37FPLxA
MSD Ignition Controller - amzn.to/3rHXodZ
▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬
0:00 - Build Plan
4:24 - Short Block
5:45 - Manley Stroker Rotating Assembly
7:45 - Texas Speed LT1 Camshaft
8:44 - ICT Billet Valley Cover
10:13 - LT1 Cylinder Head
14:44 - Front Drive Adaptations
17:43 - How to Delete Direct Injection
18:26 - LT1 Carbureted Induction
19:53 - Holley Retro-Fit Oil Pan
20:45 - Billet Specialties Tru Trac Serpentine System
21:42 - MSD Ignition System
23:50 - Dyno Testing - Авто та транспорт
Love your videos!
Hey, thanks a lot! And thanks for watching!
You may want to retract your advice about using the stock injectors to plug the holes in the heads. I have do this on a LNF Ecotec because I converted it to port injection. After driving the car less than 1000 miles it burnt the centers out of the injectors. The injectors are cooled by the fuel flowing thru them, so my advice do not use the stock injectors as plugs.
True.
In Europe there are many GDI engines converted to LPG fuel.
LPG fuel uses separate injectors (MPI), but You have to run some normal gas (10-15%) thru direct injectors just to cool them down.
Good advice to have thanks.
Would it be OK if he wasn't planning on using the injectors again or will the burnt injector drop stuff into the cylinder?
@@LT3Fluffy sounds like it will burn the tip of the injector, because there's no liquid flowing to keep it cool. Once it burns through a little it doesn't take long to start cutting into things like a torch.
@@LT3Fluffy No , it burns the center out of the injector and leaks compression out side.
It is absolutely okay to put a carb on a modern block. I love it. Badass no doubt.
Very cool and definitely different. I have a supercharged LT1 myself, so I love this. However, I am left with a few strong opinions which I'm sure you and many feel the same way about, but it has to be mentioned. Direct injection, variable cam timing, squirters and high compression are essentially what makes the LT1 what it is, now gone. Also, the same combo retaining those items would make a bit more power, probably closer to 675. In fact, with that cam, compression could have been even higher than 11.5:1. Lastly, that is a very expensive way to build a carbureted 417 cube engine. A stroker LS 6.0 or 6.2 with LS3 heads would make the same power but could cost quite a bit less. Anyways, I digress, it's still very cool to see it done and I'm glad you covered it. Keep up the good work as always!
I got to agree. Just because you can doesn't mean you should. Sure, it's neat, but so is the video of the guy that did reverse flow heads on a SBC with the exhaust coming out of the intake ports. Most of the the power of this motor is from the cam. I'm sure Gibbons asked themselves "why?" when they were asked to do this, but realized the old bastard wanting this stupidity had plenty of money. Plus, why not make a video too. Still props to the guys pulling it off. It is at the very least interesting.
You hit the nail
I was thinking you could do a lot better with an olds school SBC with a lot less custom stuff. I don't have dyno numbers to back me up but I'll bet my 383 makes more that this put out (13.5:1 though). Longevity of this build is likely better, but I know I've got a lot better oil pressure. I'd sure take the block stiffness that the new engines have though.
@@xxdabroxx nothing more, nothing less. You are just right dude 🤙🏼
@@frankmc5112 "the old bastard" 🤣, you sure have a way with words bro 🤣🤣
If strokeing means blocking off the piston oil squirt , i would save the oil squirter and choose another way to make power.
Oil squirter is a must have in ANY build IMO
When they say stroking a motor it means you're adding more throw to the crank longer throw the reason they had to get rid of the oil squirters is because now that the crank has a longer distance to go it comes higher up and would actually hit the oil squirters at the bottom of the block that's why the squirters were removed
Take for instance an old school Chevy 350 block they would stroke it by taking a 400 crank and rods and putting it into the 350 motor essentially giving you a 383
@@jasonhowell9589 yeah i get that part......
Notch the piston to clear the oil squirters.
@@natez0690 maby could work
I think weather your old school or new school that engine scratches both itches. Hot rodding is a living breathing animal love it when people reinvent a motor into there own image! Hats off to you guys!
Is it ok? It is perfect! I love seeing odd ball builds and if these are as rare as started, I look forward to seeing these more moving forward. What an animal 💪
The director injection ports would be cool to use for nitris
I was just thinking that
It's also kinda hard to make wagon wheels work on a race car.
So what's the point?
Carbed Gen. V LT???? Oh yeah, absolutely love it! I was happy to see people carb. the LS!
😵
I'll have to admit I was cringing at removing the direct injection and lowering compression but after hearing how snappy that motor sounded I suddenly found relief. Another badass 1 off build, love it.
Thanks!
@@TheHorsepowerMonster no thank you for the content... No other channel is as in depth. I wish ppl knew how much work it is to actually appreciate what they could learn from the builders and you explaining in such detail...
I also appreciate all the details you give throughout the video. Very well done. One thing I would comment is about the compression… I would not be concerned with the factory 11.5:1 compression ratio with the carburetor. With 93 octane fuel and the camshaft that was chosen, that would have worked great IMO. I built an LS3 based 349 cube de-stroked, carbureted engine that makes 600HP and has 12:1. It’s in a Nova with a 6 speed. No problem on pump gas.
Keep up the great work!
@@ceperformance sounds awesome. Shell V-power and send it...
@@Sneakdisscommentbelow
Thanks!
Here’s a short video of it…
ua-cam.com/video/JrGCAT-eVjE/v-deo.html
I think the carburetor is an awesome idea and it's a wicked idea for bracket racing also a lot easier to put a restrictor plate in then change the tune. depends sometimes!!!
I think it's a waste.
@@Torch4ya i agree,if u want old school get a sbc and use that. waste of money doing all this crap
If you guys don't like it, simple don't watch.
You won't be disappointed in your own little world.
@@chevydyall7619 It is possible to enjoy watching the content and still think it’s a waste of money and time to do the build, bub. Not everybody had to hide from information that upsets them like you apparently do... 🤷♂️
When more people do it it will get cheaper by a ton. Holley and others is going to make cast replacement parts so you do not have to buy CNC milled stuff from LME. Love their stuff ofc.
I hope you have like 9 million engine build videos ; )
The thought of slapping a carb on an LT1 should be an anathema to anyone with half a mind for how modern engines were designed to operate. What the LT1 or LT4 really needs is port injection to clean the intake valves in addition to keeping the computer controlled direct injection. Hey, GM did that with the 2019 ZR1 LT5 motor. That would at least be a real engineering exercise. “Hell, let’s slap a carb on it!” SMH Great, another informative and educational episode of POWERNATION.
She is a beast ! With all that custom work I bet the price tag is a beast too...
I really enjoyed the build , great performance from a great holley.
Thank you for " wasting time" here, appreciate the new motor build.
Thanks! And thanks for watching!
I know folks have some thoughts on this, but over all it was pretty bad ass imo. Thanks for another great video!
Cool build. Thanks for covering this. I love the build videos regardless of engine type and blah blah.
Thanks!
That was quite an interesting build... Buuuuuut......done really well and sounds amazing.
Absolutely love the way that Holley sat on the LT motor
Really neat build given how advanced this engine is and how rudimentary the fuel air and spark control is.
For the record the headers paint isn't high temp. It's simply to keep things from rusting and comes off easy on purpose.
Well cool! A 38% increase from standard is awesome! An with a purpose built intake, and I’d say, ported exhaust ports. This pinocle of V8 power! Will gain a even bigger percentage of power!
As always you’ve created a great video, With a awesome engine!!
I got my new Hemi T shirt last month! Although the XL! It seems I need a XXL!!! Lol!
Thanks again bud for another great watch!!!!
Hey, thanks a lot!
When the end of the world comes it is nice to know you validly carb it. , science and engineering is so awesome thanks so much for sharing thud build.
Yes this is a definite blend of old school with a modern twist on a more or less new generation 5 small block GM V8. It sounds absolutely beautiful. I like the huge hp and torque numbers. That's why IMO old school will never die;you just proved it can work with modern engines. Guys did you know the 417 CID you got out of this engine build is similar to the old 6.9 liter (417 CID) Mercedes Benz V8? They were used in NA up to '79 and were a torquey V8. In fact I've seen a few stoplight getaways won with this 6.9 V8 in MB cars of the day. Gr8 job guys. ☺🙏👍💪💯
I have been running LT1 heads on my Ly6 for about a year first with carb, now hi-ram efi, and I sold some parts to a dude in cali that had his gen v running with a carb months ago
"So the plan is to make up the difference in cubic inches." - I love the american approach to turbocharging
Big Pete!!!!! Built my engine for my 76 corvette! A1!!!
Great job! I would do the same thing. Hopefully the aftermarket cones up with a decent intake.
it is a Chevy of course there will be more than one available. .
Everyone thinks EFI is cool until it comes to wiring lol. I love carbed engines I recently changed my 302 Ford Windsor to carburetor and I'm amazed at how much better and easier it is to operate. Love this project!
Sorry. I dozed off momentarily I
Chevys tend to put me to sleep. Nothing personal. It’s simply the nature of Chevy overload. 😵💫
@@danielwilson6665 dude did you even READ my post? 🤣 I said FORD 302 not Chevy
@@ethanbunch3274… Dude, please accept my apology. Too many Chevys have obviously fried my brain.
@@danielwilson6665 nah you're good man lol. I'm the same way at car shows it's just another 383 stroked sbc in a hot rod. I get sick of looking at them too
The novelty of being unique is what some other people value. Don't care if you make a steam-powered GenV LT1, if a customer is willing to pay then someone will build it.
Always enjoy the videos, even oddball stuff like this. All this to be able to occasionally do a jet change? I’m not crazy about direct injection, but going to a carb just seems backwards.
Gotta admit though, this is real hot rodding.
David Vizard would have probably specced about a 108 lsa for this combo.
people are always fussing bout someone putting a carb on a modern engine until they get gapped by one....🤣💪
I dig they used a tighter LSA cam. Carbs are great if one knows how to tune them. I’m a KISS type of guy, so carbs appeal to me although this build was way above my pay grade! Lol
Awesome stuff though, she sounded a bit like RO7 😎
Nice! Thanks for the content… however what kind of modifications was done to the cam position sensor for the LS ignition module to function on an Gen 5 LT1 engine?
Would I trade out modern programmable efi for a Carb(s.) Never. In all classes where efi is allowed. Efi cars are faster, more consistent, easier to drive (in all forms of motorsport) and critically easier to tune with so much data/granular control over every aspect.
So much so I opted for quad 50mm throttles on my new tarmac rally motor vs 48mm dellorto's.
But regards the build detailed here. The customer gets what the customer wants. If they're happy with the results. That's all that matters.
Jordan
EFI is safer, but with sensors constantly breaking, I'd argue carbs are way more reliable. The carb will get you down the track the same way(within reason). EFI will pull timing if it senses anything wrong, and as far as I know, efi systems dont detect broken sensors. Which will probably change in the future. Right now its a crapshoot. The one major advantage efi has over car in my opinion is for HPDE environments and drifting, where a normal carb will starve of fuel
unrelated: carbs sound better than EFI
@@e36blur carbs do sound better I agree. However I wouldn’t drop $5k+ on different boxes/computers to get the same data a terminator x will. And I hook the laptop up to one thing. I don’t have to go box to box to read data
@@zachawge8576 How do carbs sound any different that EFI?
@@JohnnyAnderson1 Carbs are much more responsive and tend to produce a bit more motor noise from what I’ve noticed. Mostly notice the sound difference cracking the throttle , you can tell for sure
I find this very interesting I’d not slept last night and this keep me so interested I watched wide awake..
It’s pretty cool seeing what it takes to Reverse engineer new innovations in old tech v8’s..
I’m going to miss v8’s when GM follows to go batteries on wheels
I’d like that set up especially when not computer savvy but mechanically good
If you're not really computer savvy and you like carburetors Holly has a self learning throttle body to really interesting to look into tricks a lot of guys cuz it looks like a carburetor
Very impressive, nice job.
Yes,!!! Great for bracket foot brake racing!!!
Not only do i approve of the carb, i LOVE it ; )
One hand: Just because you can doesn't mean you should.
Other hand: In the name of Science!
Badass!! I was wondering if anyone has done it yet
Nice video, but 11.5:1 compression is still very doable on pump gas without direct injection.
man..thats on the edge..unless you mix a little 110 at the track........
@@harryharry3193 no way, a STOCK ls2 is 11:1
24:49 that oil pressure is fine. As long as it has more than 4-5 pounds at idle it's gucci, and anything over 30lbs once it's past 1200 or so is fine.
Seems like it would of been easier to teach the bloke how to use a tuning program at the track haha
Thank god for something original, guys ! Subbed !
Hey, thanks a lot!
Commenting for the algorithm:
It's okay to do whatever you want to whatever engine you want. :) if dude prefers a carb, put a carb on it. Idk why people trip sometimes.
Gotta love those numbers....
My 1967 L88 427CI which had 12.5-1 ran just fine on pump gas but Vehicle documentation stated, “This unit operates on Sunoco 260 or equivalent gas of very high octane. Under no circumstances should regular gasoline be used.”
PRESSURE is defined as lb/sq inch or force/per area. Springs do not exert pressure. They exert force or load in compression. I had trouble wrapping my head around this as a new mechanical engineering student.
I've been hunting for the carb victor jr intake for this engine for 2years almost 3 & no luck ! I've searched Holley & Edelbrock high & low. By the way will a LS crankshaft fit right in a LT block ?
Mast Motorsports is working on a carbed intake for the LT1. Not sure if it is out yet. Don't know about the crank.
@@TheHorsepowerMonster thanks for the response.
Those adapters are hurting power but I understand you use what ya got. Would love to see a comparison of factory direct fuel injection vs traditional injection vs carb (when a direct fit manifold is available) thanks for sharing the build.
The DI can run much higher compression on pump gas. Cant run 11.5 in port injection or carb.
The DI will make the most power.
Omg such an oddball!
A late model Chev V8 engine.
Don't see too many of those on youtube.
The builder should have been aware of the paint on the PaceSetter Headers. For example, here's what SummitRacing states about the paint: "(Special warning regarding PaceSetter painted headers only: The paint on these headers is not designed as a final finish; it is designed to protect the headers after the manufacturing process and during shipping. This paint will not withstand the high heat associated with engine break-in, nor will it withstand the heat cycles associated with any type of driving. It is recommended that this protective coating be stripped, and a high-heat paint or coating designed for use on headers be applied.)" Edit: From the Pace Setter web site: "BLACK COATING FOR PRE-USE PROTECTION ONLY".
Ah, interesting. That comment was just me. The builder just kind of shrugged at it. Thanks for watching!
Great for speedway use.
Be good to see how u sort the ignition system and advance
great build....
Awesome content brother
Thanks very much!
Very impressive
This is a cool build but it brings up something I've wondered about.
Is it possible (since you now have a carb) to use the DI system as a fully adjustable power adder utilizing Nitromethane?
Don't think Top Fuel, I'm not talking about that much Nitro.
Awesome!!
As far as putting a carburetor on a modern L/S or anything modern for that matter. This girl says Kinda like Burger King. It's your engine might as well have it your way. If he's comfortable working with carburetors. It's really not any different than taking a small block from the 60s or 70s and putting fuel injection on.
Personally, I do love the carburetor cuz you don't have the electronic engine control module to go out. They will go out at the most inopportune time and place. You have to really work hard to break a carburetor.
While I do love the modern makeover the old reliable small block and they made great improvements. And yes, fuel injection and computer-controlled ignition can be made to do wondrous things. I still love the old school simple dead reliable 4 barrel. It's actually funny watching young guys scratching their head trying to figure out a carburetor and Mallory dual point distributor! You hand them a screwdriver and a feeler gauge. They look at you like you're from another planet.
Well, I've already gotten way more long-winded than I intended to take care good luck with the Corvette. You keep posting videos and this girl keep watching
Yes I do like it
Awesome SBC!😍😍🇺🇸🇺🇸💪💪
Carb life, heck yeah
what is the advantage of doing it this way than just carberateing an ls3? it kinda seems like all the new stuff for this platform was either deleted or blocked off.
You are basically right. The customer somehow had the rotating assembly, not sure how or why he got it. And he asked for it to be built with a carb. I'm thinking he just wanted something different. Thanks for watching!
It depends on camshaft selection as to weather an engine will work on pump gas with high comp.
This makes ls builds look like old school 350 builds. Dod/AFM/vvt can pack their bags any day now! Haha
Really cool
The paint on the headers is shipping/shelf paint to prevent rust. They must be torched and or scuffed and painted with something like VHT header paint or ceramic coated.
Yep, you are right. My rant was a little unnecessary.
It’s cool for sure
I’d be willing to bet it’s some old guy who’s terrified of the tuning laptop
if the customer can't tune direct injection a carb is all you can do. I would encourage an LS carb in that case. I just don't see the advantage but whatever floats the boat.
Carb the world!
It does sound good. 😎
I'm not a mechanic, but I think the silver color of the parts and machines makes them easier in terms of assembly and disassembly, you can see what you're installing unlike the black color, it causes a little distraction
if u use injectors to plug the ports u will just burn them up and cause a compression leak because there is no fuel flowing through them to cool them down.
I like that a lot!
Isn't that the Ford Windsor valve arrangement and won't those heads bolt onto a Windsor block???
Crazy thoughts
Very impressive with 10.5 to` comp.
Of course it's okay to carb a new gen engine I would like to see a gen3 hemi with a carb and distributor and there is a kit for that it uses a modified timing chain cover and gear to drive the distributor and only uses one spark plug per hole but absolutely no computer is needed so you can get the old look and easy swap to any car
Sick nasty
27:16 I'd like to see a low rise dual plane optimized for street driving. Something meant to give excellent idle, cold starting, all weather performance in the 800-2800rpm range where a daily driver spends its time. That medium rise single plane is gonna run like a scalded dog in the upper half of the tach...which the dyno graph bears out...but it's gonna run like shit down low.
It’d be good to hear the exhaust outside when they are running them
why not just add one of those aftermarket injector units with the wired control pad? That seems like the best of both worlds. Less build expense and easy at track adjustability. BUT, it is a FREE country. Carb it if you like by all means.
I always love these vids id also like to know how much these builds cost mostly to see if a blue collar like me could have something like what you show built
Thanks for the compliment. I don't bother with cost because no matter what an engine builder tells me an engine costs, his competition will start peppering their customers with "I can do that cheaper." There's no benefit to the builder. Second, the way things are going now with inflation, the cost would barely be accurate 30 days after the video is published. Many of my engine build videos are still going strong two years later. So there's no benefit to the viewer. Anyhow, that's my reasoning. Thanks for watching!
I wonder if you might have asked Hogan to fab up a sheet metal intake for this or is cast a requirement ?
Finally something I can do with the junk LT1 in the garage
Is the performance flathead video still happening, i feel like I’ve been waiting forever
It is still in the works. Keith is on his third iteration of the engine. The first two both had problems with the block not being able to handle the power. After a couple of heat cycles they would start leaking water into the chambers. Hopefully soon, and I'll make sure to talk about the setbacks in the video too. Thanks for watching!
You can run what you want.
but ultimately the LT heads and pistons are designed for direct injection.
if it does a goor, or great job, it's always good to carburate.
Should have kept the 11.5 compression and ran it on E85 E85 is 100+ octane should keep the engine out of detonation pretty sure it should be worth 20 or more horsepower upping compression from 10.5 to 11.5 throughout the entire RPM range with a little more pop
Heck yeah. Carbs are proven to make more power if tuned right. Colder intake air temps for sure.
run them rich!!!! get power
GRAET research you all MANY HOURS DAY'S AND MANY CONCRETE WALLS YOU HAVE TO NOCK DOWN TO GET TO YOUR GOLD YOU ARE GRAET THAT'S WHAT INGENUITY IS ALL ABOUT LOVE YOU BROTHERS
When I saw the oil pressure on the screen dropping out to high 20's at over 6000 i was cringing.. I have the same oil pan but am concerned there isn't enough volume and its pulling in air... Wonder if the bottom end is still alive today?
Next, the world's first lead gasoline Coyote
I want to put carb on my cummins diesal. Seriously the compression , pistons and heads are design for DI.
Personally, I think it's always more than ok to put a carb on modern engines. In fact, I wish more people would. There are a lot of really good carbs being produced by boutique carb builders that perform very well. So yeah, new school self learning injection that masquerades as dominators are just as cool as actual old school dominators feeding new school engines. And that is Just my dos pesos 😎
carbs are ..dumb... they just dump fuel... no feedback loop to meter the fuel at sea level or at 2000 meters...
I love reading the comments when people think because it's old technology means it's not going to be as good or make as much horsepower people really need to keep an open mind there are a lot of old school tricks that you can do to New School motors to make lots of horsepower there are things companies are doing to motors that are old school like windage trays oil squirters roller valve trains it's not new technology it's just being used in newer motors more efficiently