DANGER in the Dyno Room - 440 6 Barrel MONSTER
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- Опубліковано 26 лис 2023
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Nick works with dangerous machinery every day, but these big engines can still find new ways to be threatening.
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Not to take away from Nick or any of his work. I bought a 63 valiant station wagon with a slant 6 . I'm 63 I've been a mechanic all my life and my friend has been a mechanic for 68 years. Just spoke to him on the phone 5 minutes ago he was opening up the shop he's been there since 1976.. anyway I was trying to start my slant six Harold was here the old man he'll be 80 this week. The slant six had 30 lb of compression and Harold said it won't run. Minor tune-up and carburetor overhaul and the thing runs like a million dollars we were both completely shocked. But ya can't Kill a slant 6... I love Nick and everything he does he is very very Humble man ! Good bye 2023 🎉
I am a mechanic my self and it's hard to find a honest one these days it's awsome to see one that's why his shop is one of the very best .
the 440 is a bruit force engine . best engine that Mopar ever built. i am 60 years old and when i hear 440 i stop watch and listen !
I'd be shocked if Nick were anything less than honest. It's obvious by the way he conducts himself that he's a true professional, and a gentleman. People like him don't need to be dishonest. Nick is like your trusted family physician, you can trust Dr. Panaritis.
100%
Very well said
Ya the guy seriously deserves everything he's got
It's good to see Nick check, double check, triple check. He finds problems that are sneaky that could easily be overlooked.
Nick is always the consummate professional even when he make a small mistake hey owns up to it! Best mopar show on you tube bar none!
Thank you. Very much appreciated.
@@NicksGarage Nick you caused that fuel leak when you pulled the engine ,perhaps .
Nick what does 185 compression equal to in standard US numbers ?
Sure, but why run up an engine you don't know, run it a little, listen, then tune it to be sure nothing really bad goes wrong. One of those carbs is off no doubt, and do the compression and set the timing to a run well position to get started. The fuel leak drama was totally unnecessary...
@@zcam1969 It is standard imperial. 185 is 185 psi (pounds per square inch). All standard imperial measurements. In metric it would be 1275.53 kpa.
I’m a 45 year vw air cooled specialist. I have a love for big v8 engines also. Can’t beat muscle. My street chop top bug daily driver runs high 12’s low 13’s. 4 cyl. I appreciate nicks vast knowledge. And endless experience. Most of all his ability to relate in a way anyone can understand his process. He’s got his thing down. What a pro.
Fantastic job Nick. I do compression test exactly the same as you. A 80yo retired mechanic taught me when I was 15yo, I'm 50 now.
Hi Nick and all your crew
Hello!
Nick. You are a very honest man! You could have had George edit that part out. But it shows you want to show the viewers the possible consequences of a fuel leak! 👍👍
The truth will set you free! 👍
Nick is just a knowledgeable, like able guy. Can’t get enough of theses videos
I love these dyno tests where Nick is operating solo and brainstorming out loud as he goes.
Thanks. We love the dyno too!
Personally, I hate having others around when I'm trying to trouble-shoot something. Even my closest friends. They might mean well, but they're a distraction. If I want expert advise, I'll talk to myself!
@@pb68slab18 You know, I actually agree with you. Even when I'd take my 68 440 b-body to the drag strip, I'd tend to pit fairly far off. Always having people standing over me while tuning etc tended to distract me. Was never a jerk about it but I need space to think about what I'm doing and not a lot of yik yakking going on.
Totally enjoy it.
Loved it when my dad would talk about why this was left or right or too loose/tight/hot or cold. Anytime he talked while I helped him in the garage, he was sharing himself. Now, I just have his tools and memories. I'm a lucky man.
I just rebuilt my six barrel carbs for my 440 about 6 months ago. And had several leaks I had to resolve. So I feel his pain. Nick you did good as always. I really like the look of a Six Barrel set up. And when those secondaries come in. Whow Nelly. What a kick in the butt. Thanks for the video Nick.
That high camera clip at the beginning was awesome.
Hi Dr.Nick, Hi George.
Hi Eric. Thanks for being here.
Thanks!
Thank YOU. We really appreciate the support. ❤️
That fuel line needs to be re-routed away from the distributor no matter what for safety, but you already know that Nick. Glad you saw the leak and avoided a fire. I`m sure once the refresh is done, Nick can get 1hp per cube. Nick at his best in his favorite room, the Dyno Room, mine too. I love watching the Master at work. As usual George, outstanding camera work.
WOW!!! Too close for comfort!! Thank God Nick found those leaks (ESPECIALLY that 3rd one)before something bad happened. I was driving a friend's car years ago, it had a carb problem and caught fire WHILE I was driving it!!! Thank God for Nick's patience and thoroughness. Great week, all!!
So did you get it out or did it burn to the tires ???
@@bluecollar58 thankfully, we did get it extinguished, but not before it destroyed some of the wiring. It was an AMC Javelin with a pumped up 390, which we did get running again.
I just love watching Nick work his magic building an engine then testing it on the dyno. This is relaxing, exciting, interesting and informative to watch. I used to rebuild engines with my dad starting as a teenager. Later on when I was working as a toolmaker in a small job shop I could custom make parts and machine what we needed for an engine and that definitely lead to some crazy projects. Watching these videos takes me back to those days with my dad. Thanks Nick for all you do! Cheers from the southern border of upstate New York.
I love the dedication and honesty of the shop. Lots of places would nickel and dime you for things you don't really need. Great Job Nick. I was a bit nervous with the gas leaking about.
Yasoo palikari. Tuned in from Adelaide Australia
Right on Steve! 🇦🇺❤️
@@NicksGarage
I work in a petrol station in Lennox Head in Australia. It's a very small town.
Anyway a fella walked in yesterday with some go-fast racing brands on his shirt. Just to make small talk I said "Hey do you ever watch Nick's Garage on UA-cam?"
He said "Nick Panaritis? Yeah, best channel out there, guy's a legend."
So you're building an international reputation Nick, well done!
It’s always a pleasure to watch the master. Great job guys!
The carbs are the problem and Nick knew that immediately. Still checked for other issues. Rebuilt carbs will make all the difference in power and street driving. Well done as always Nick.
Absolutely the best auto show on utube! Would be a hit on cable.
It's always good to see the Mopar man working on Mopars and honestly figuring them out and then telling his clients honestly what needs to be done you don't find that very often Nick you're the best buddy and everyone loves you thanks for the you two.✌
Professionals like Nick do good in making money. Their true need is the feeling of accomplishment. To take an engine and rebuild it and charge a lot of money for an engine that doesn't need it does not give that to Nick. He will feel great to rebuild the carbs and detail the engines will make Nick happy.
I was at MCACN, too many cars to see in one day. I'll be in Montreal in a bit, Tony will have his Olds 350 on your Dyno. I lugged this rare engine back from Houston in May, 1 of 1352 W31 small block 350s
You do get around!
So Cool Nick!! A reminder and lesson to always check the basics. Consistent high compression and overall smooth running, this makes a great cruiser.
Man that's a tight 440, fresh paint , rebuild the carbs. Light the tires 👍
Nice lighting George! Glad nothing bad happened. Thanks guys! 😺
Thanks 👍
Damn near blew the Garage up .. that was a cloose one !
nice to see, step by step explanation, thank you.
I can spend hours looking at someone who is so passionate.☘️
You're very welcome!
Impressed with 185psi of cranking compression with cast iron heads. The fact the carbs are jetted so rich is protecting the engine from pinging itself to death. Probably also why it didn’t like the extra 2 degrees of ignition.
You make two excellent points. I wonder why the idle circuit is so lean though. Carb overhauls will probably fix both problems.
@@stephenmoxley3004 idle lean to clean and anti-foul the plugs when loafing around street driving. as long as it's instantly fat with the faintest touch of pedal, it shouldn't rattle itself apart. that's about the oldest trick in the books, although there's a fine line between lean and too lean!
the carbs are rich to supply fuel while its leaking
@@stephenmoxley3004 the idle circuit is low because its a rich environment with the hood closed and after throttle. drive it and let off and theres unburnt fuel everywhere inside and out.
160 is good compression on any healthy motor. 180 is also pretty normal.
A while ago, I was ignorant to a Six Pack setup.
But having putting one on my '74 Power Wagon I've owned since I ordered it from Dodge in August '73. 50 years ago this month! I installed it back in '91, and have been running it since then. I've become very familiar with it. I found an article in Mopar Muscle quite a few years back on tuning a set of 4 barrels on a Hemi. Which was an amazing help.
Essentially a Six Pack/ Six Barrel is one primary carb (center) and two secondaries (outboard). So tuning them isn't all that difficult.
I ended up drilling and tapping out the Idle Air Bleeds in the center carb so I could replace them for tuning. This helped with the too lean idle and tip in problems I was experiencing. I'm running a Quick Fuel metering block on the center primary carb. This also helps because it offers tuning on the Idle Fuel Restrictors. I also have Pro Form throttle bodies on the outboard carbs. They are the setup for tuning A/F ratios on them. Providing access. I'm running 3 Canton Phenolic Blocks under each carb. Which stops any heat issues.
All these things kill anybody trying to be totally stock. But... I drive my truck daily. And I would be willing to bet I put more mileage on a Six Pack engine than anybody else around.
I'm currently running a stroked 440 with Indy aluminum heads. A hydraulic roller cam. And it is a torque monster. I can be a handful driving it around. But that's what makes it so much fun.
For the whole story go to Ramcharger Central. com. Go down to the "Picture Section". Click on "Rams, Power Wagon's, D W 50's etc."
Search and click on "My '74 Power Wagon I Ordered from Dodge on 8/73".
I would put a link here, but You Tube won't let me.
The story is very long because it's been 50 years in the making.
Dyno runs are always fun and interesting.....great job Nick
I learn a whole lot from Nick. Hes the best😊
Awesome! Thanks.
The dyno runs keep me coming back!
Nick and George, love the dyno room every time !!! That ol girl wasnt doing bad at all on horse power and toque . Nick , you build and tune those ol Mopars in your Sleep !!! When i saw the fuel running down the dist. ,my ol blood pressure jump for a bit !!! My luck I would have had a plug wire arching ...Great Monday Show !!!! Yall take care .
A good friend just bot a '69 Corvair convert 140 4 carb HiPo 4 speed convert. We'll pick it up Friday. 2 owner California car in Detroit, not running due to (typical large valve) dropped valve seat... EZ PZ... I'm CORVAIRWILD!!! Red black black 54k
Sounds like a fun project.
Bot?? It's bought. Even a guy from overseas knows that grammar.
@@VineV-Dutch I thot sough
Yes 440! Thanks Nick 👍
Nice!
Thanks!
Those engine carburators are F****D up! The engine wouldn't shut off. I'm glad to see the compression test that tells a good story. Next time, it should be more exciting to watch after the carburators are rebuilt betters! This is a man's Soap Opra show!
Perfect digit nostalgic on this man's engine I would have done it the same way but in the car being I don't have a Dino GODSPEED NICK
This engine is in great mechanical condition, the run-on issue when shutting it down may be due to some hot spots in the cylinder heads, or sparkplug heat range IMHO. Carbs? Float settings, power valve in center carb leaking a bit, did anyone drill out fuel orifices in the outboard metering plates? Outboard carbs opening OK when throttle is advanced. Just my guess, having worked on stuff like this in the past, be interesting to see how it runs when you get the carbs back from your guy, and see how well it cleans up. These 440-6 bbl engines haul some serious butt!
Kudos to you, Nick, for admitting a mistake and explaining why, and fixing it correctly to do a dyno pull. Right on, that is classy. You rock, man.
Thanks, Nick, for a good & comprehensive video on this engine! Look forward to the next video on this engine!
Man...Do I wish I had an engine dyno. That's the hot setup to maximize engine output.
That engine's got lots of power. A few adjustments, repair the carbs and watch it run!
Thanks for the video.
Good one Nick!
George , mannnn, I love those intros you do crusing through the shop ...They just keep getting better along with your editing !!!! You and Nick make it the best Muscle Car Channel on UA-cam!!!!! Bar None !!!
Yea, He sounds like a pro radio personality. Smooth deep voice, confident and pleasant to listen to. 😊😊
Love it. Ty for sharing the footage Nick. One day I hope to have another car that makes me smile again when I drive it. God Bless.
Doesnt need an overhaul. Just a little loving from Nick
Nick I love what you do, your a consummate professional!
I hope next year I can make the drive up from Philadelphia pa to meet you and see what you do!
Hi Nick, now you have a great car in there. Is that a true 58 283 Dual Quad Vette with a 4 speed? Now that is a car!! Hammer Screwdriver Test Light and Pliers. And the easiest engine to fix on the planet. Thanks 🙏
Isn't is a beauty? And in the same family for 50 years now.
Nick's dyno videos are the best. Maestro of the Mopars.
Glad you like them!
A portable fire extinguisher mounted to the back of the control room door might be an idea, Nick.
Great music on this one George. The leaky part reminds me of the training montage music from Rocky 4. I was expecting Ivan Drago to walk in!
I'm impressed you don't have fuel leaks, all those bloody inverted flare fittings and none of them all that easy to get a wrench on other than the front carb. They're also not fun to tune in the factory condition because they use metering plates on the secondary carbs.
I truely hate fuel leaks and fix them as soon as I see them. Lucky that I've only been in one car fire,and that was a cab of all things.
Nick-this is the best video I've seen you make, Measured power displayed, Barometer displayed, Vapor pressure displayed, Temperature displayed, Humidity displayed, and last but not least the Correction factor displayed. You guys out there making dyno videos take note this is how its done! BTW I liked the negative TQ meter as the engine was running-very real numbers, 20 HP from the observed to the corrected, 1.032 correction.
Glad you enjoyed it!
Nick, again you had me at the edge of my seat. Thank you for the adventure and cheers from Hamilton, Ontario.
Glad you enjoyed it.
Hi Nick I enjoy your videos I like your Dyno testing videos but must of all I like your show because it reminds of my 71 duster with a 340 with a sex pack I had to sale it to pay medical bills I really loved that car I always tried to save the money to get a nother 340 duster but something always came up now I am 73 and on social security so my dream of have a duster. But watching you show I get to see all the classic mopars thank you for putting on a great show
Great video Nick! That’s a hell of an engine!
I guess not having fan blades when installed on the dyno is a plus to keep that fuel leak from flying everywhere.
Nick keeps a cool head, that comes from many years of experience. 😊
I'm glad to see you're still playing with your toys, Nick!!!! One of my favorite Canucks!
I'm glad I found you and subscribed!
Thanks for the sub!
Nick, I'm a long time fan and subscriber to your channel. Good catch on noticing the fuel leak before anything serious happened with the 440. At 12:38 in this video, you demonstrated that you have two fire extinguishers in your dyno room and as a retired Fire Prevention Officer with my municipality's fire department, I'm very glad to see that. However, I also couldn't help but notice that both fire extinguishers are free-standing on the floor. NFPA-10 (National Fire Protection Association - 10), The Standard for Portable Fire Extinguishers, states that portable fire extinguishers are to be mounted such that the bottom of the extinguisher is not closer than 4 inches (100mm) to the ground and the top of the extinguisher is not more than 5 feet (1.524 meters) above the floor. If the Fire Department in your part of Quebec is anything like the one I used to work for here in New Brunswick, then I would be hugely surprised to learn that they have ever sent a Fire Prevention Officer to your shop to perform a fire safety inspection, as our fire department, and the Provincial Office of the Fire Marshal (at least here in New Brunswick) tend to focus their inspection efforts more so on residential and institutional buildings (nursing homes, special care homes, etc.). Anyway, I just thought I'd let you know about that little technicality. Please keep up the great work you and your team do in keeping old school muscle flexing into the future.
I noticed fire extinguishers on the floor as well. I’m not a professional who can cite regulations, and I’m not Canadian, either, but I think the U.S. has similar OSHA or NFPA regulations. As part of the maintenance team at a major industrial site, it was my responsibility to perform a monthly inspection of our department’s 50-odd fire extinguishers. They were all mounted waist or chest high, and they all required identifying signage installed 10 ft above floor level so that the extinguishers could be located behind rolling rack, behind or beside machinery, etc. I’ve noticed similar signage in retail settings (Walmart, Lowe’s, etc. As a technician, I questioned the need for installing the signage, but I came to see the wisdom of it. Now, entering an an establishment, a quick glance around tells me where every extinguisher in the room is, and I find comfort in the knowledge.
Holy Cow! The first minute of Nick's "Showroom' ! I hope it's all insured for loss/theft.. Beau tiful!
Dang man what were you thinking with a giant trail on the manifold. Turn the pump on and wait for the leak stone cold . That heat soak fuel spray is like a bomb . I would have condemned the carbs for an immediate rebuild or replacement with reproduction units. Sending you a blessing of protection brother be safe.$5 says the float needles are sticking on top of everything. The center was to lean trying to compensate for the other two flooding out .
Greetings from South Carolina Nick & crew. The Dyno room always gets my motor running. Looks like you have some tuning to do either those carbs. Interested to see the numbers after the rebuild.👍✌️
We love the dyno too! And yes, we will keep you up to date.
The center carb is supposed to be a 350cfm, the two outers are 500cfm, for a total of 1350cfm
Looking forward to seeing the work on this engine. Just had a 440 rebuild and a 6bbl setup for my 69 Roadrunner convertible, which was purchased with a 383 6bbl setup.
It's no time for laughter when you're narrowly averting disaster and Nick is no stranger to danger He is a master Leaking fuel is scary beast but it won't harm Nick in the least Cuz mechanical beligerance ain't no match to Nick's Garages dilligence This is a real show I'm on the edge of my seat hoping this 440 don't blow But there's no panic from Nick experience has made him slick He spotted the big leak right away cuz his attention to detail is so quick Good stuff Nick don't waste customers money when an oil change and a tune up is enough Ain't no fuel leak gonna call Nicks bluff Cheers Nick and George Watching Nicks Garage rewards
Wooooo! Roberto ripping it up in the comment section. Keeping the channel heading in the right direction. With viewers like Roberto we feel super blessed. Big up, Roberto. Big up your chest. ⭐️
Waow with your rhyme I'm impressed and every week you provide such excellent content for this petrol head to injest You're the best@@NicksGarage
I build engines over in BC they call me the Duke of engines mostly Ford draggers @ chev anything !!! LS anything but I never invested in a Dyno but I have built Any V8 made since the 50s !!!! Your Chanel is inspiring
Interesting dyno test! My father had a 1970 Charger R/T that caught on fire the same way. Leaky spark plug wires and a fuel line starting spraying gas after the pump. It happened right after he started it one day at home. He got it put out quick but it was a mess cause he used one of those powdered soda fire extinguishers. It got it put out fast though. Didn't take much, just one spark from those old wires. There was minimal damage since it was put out so fast.
Great spotting and owning your error Nick. What's more that 440 is going to look and run perfect once you and Don do the detail and refurbish it needs. George top intro for this video too thanks.
Thanks 👍 Appreciated, Blinkie.
Nick almost blow the Garage up
I know, He was one very lucky man that evening.
Made it 😊
Atta boy Moose!
It's a wonder it didn't burn up!
Have a smell of gas in the car I would think?
No. This was a fitting that was only used in the dyno.
I watch many carburetors from the top view now. I don't like the way the gas comes out.
A little nervous going in 😮
But my faith in Nick eases the worry
Nick, you need an emergency stop button in the dyno room that will kill all electric power instantly so that you dont have to walk all the way back to the observatory to shut down. I love watching you run mopar goodness on that dyno. Dont burn down all that awesomeness in the shop!
Dripping fuel from the boosters at high idle rpm
Great 👍 video as always Nick'
Close call in the room good thing you seen it
Yes it was!
Thank you Nick...!!! Great episode..!!!
Evenin George an Mr Nick!! Have a Great week!!
Nick my friend you are the BEST.......Thanks NICKORU and GEORGEORU the camera man = Shoe🇺🇸
Right off the bat, I noticed the back carburetor fuel line was leaking.
Well spotted. We were two guys in the room and it still took us a minute.
I saw that too. Right at 5:25 of the video.
I know too well this scenario. I had a bad leak on the banjo fitting of my Edelbrock carb on my 396. The points ignited it and it was a near disaster. Burned the wiring harness and all the plug wires. Now I’m always on the lookout for fuel leaks.
You're right on track with the carburetors overhaul. 😊❤
Always a great video. Your experience continues to shine
Thank you! Update coming soon.
THAT MOPAR IS BAD ASS MAN!!
Honesty is the best policy.. great job Nick aka Bob Barker from (the price is right)
Thank you Nick
Thank you!
Nick rules!!!👍👍
You're a bad ass nick
they very likely tuned it fat to cope with higher altitudes and high compression(what's a little HP cost vs. it rattling itself apart!).
lean idle cleans the plugs when loafing around the streets, although that looked way too lean, the air cleaner and angle of engine in vehicle can change it somewhat.
run hard/dyno pull, just idle a bit before trying to shut down, even with lean idle the heads/valves/seats/plugs will cool and it should shut down smoothly.
Can’t argue with those cylinder pressures, get them carbs super tuned and I guarantee Nick will find some extra horsepower 👍 weird how it was dieseling like that, he may need some real high octane fuel
NO! The engine is missing the idle solenoid that SHUTS the throttle blade on the primary Carb... That is why the engineers put them onto the Six Packs. (And other engines of the time.) With the throttle blade opened slightly by the idle screw setting... Extra fuel gets by... That is what you get on shutdown!
@@frankparks4900 ....That is correct. Have one on order for that reason.
@@frankparks4900my understanding is the throttle solenoid provided a slightly higher idle , and when shutting down it just went to a lower idle position, it did not completely shut the throttle plates. I had a 1970 Satellite I put a 440 with a factory 6 pack aluminum manifold and factory Holly carbs, it did not have the Solenoid and I never had dieseling/engine run-on. Have talked to and seen on Mopar forums that others have not used them and also had no issues. I would actually suspect the rich running carbs at high rpm’s when testing then shutting down shortly after Dyno pulls has unburnt fuel puddled in the manifold . Just my thought.
You don't Know what you don't know... Most people who ran them without the solenoids in the day weren't worried with such a thing... The engineers put those solenoid kits on 70-72 340 engines and more than a few HP 440 4 Bl. engines... Knowing that just in case the conditions were right for the "DREADED RUN-ON"... They had you covered! I am a firm believer in the factory service manuals and procedures the Chrysler engineers provided! Even today SO MANY enthusiasts of the carbureted Muscle cars JUST DON'T HAVE A CLUE! Their "solution" after "Carburetor Frustration" is the VERY expensive Fuel Injection rabbit hole! @@jeffosim8789
Thanks Nick good job learn something today on compression test thank you
Nick
Your capitulator is out of adjustment on your dyno! Time to resync the two demler tubes inside the variable spin turbine!😂😂😂😂😂
A Fantastic view Nick! Appreciate this amazing video on the 440 6pack lol I remember my friends GTX with the 440 6p he had a solenoid & switch in the glove box to lift or drop the hood scoop! Lol as a young buck that got me into Mopar. Appreciate your efforts and quality content Nick appreciate you Bro for all you do friend.
Luv&Peace!
Cheers !🍻 to you & your awesome family! To health,happiness & success! 💛✌🏼💫
Love your passion, videos, content,, can you maybe do a comparison on the 440,and Chevy 427
Great video Nick, thank you for sharing!
Glad you enjoyed it!
Nick, you have a loose booster closest to the distributor, gas is coming out of where its mounted and getting sucked in the air bleed hole
Nice vid Nick. I noticed right away the rear carb was leaking at the beginning of the video. Just after you turned on the fuel pump.
Great content thanks for sharing
This type of engine is the reason why it's never a bad idea to update to electronic throttle body fuel injection.
I'd check the cam timing with that engine run on.
Cylinders might be fuel of carbon causing hot spots and that run on...
Center carb is lean, the outer two are dumping fuel, judging by the flow thru the boosters. I'd suggest lowering the outer carbs' float levels to temporarily see if it helps. They have metering plates, there are aftermarket plates which use jets. There may be 35hp in the jetting.
You are correct.
with that high of compression and cast iron heads, it will rattle itself to oblivion if leaned out much at all. (pre-ignition death). leave it alone, especially if they drive to higher altitudes than where it's currently at. while that lean was idle looked way overboard, lean idle is very old school plug clean/anti-foul for loafing around on the streets technique, it needs to instantly be fat/lots of accel pump on slightest pedal touch to not rattle apart.
Actually, higher altitudes will richen up the mixture even more, as there is less O2 per cubic foot at higher altitudes. This is also why more compression is used at higher altitudes. You could look it up.
Thanks for the personal reply, I watch all your episodes! @@nickpanaritis4122
@@richardfehr1838 in a perfect world yes, that's what always happens. in the real world with various carburetors, ignition systems, compression, spark pugs and head design, bad things can happen with any elevation change. like a second ignition in middle of exhaust/intake stroke.
example: waste spark ignition setup and too much leftover fuel with hot spots. yes that can happen even when it's rich.
nothing like some thin air to find flaws, as well as lean at sea level. 🤪
Motor dieseling on shut off. Maybe lots of carbon on valves from
Rich mixture. Pull heads. Clean up heads and fix carbs.