1973 Corvette Stingray 454 Engine Is Hiding A Big Problem!

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2 жыл бұрын

In the last video, this 1973 Big Block Corvette Ran for the first time since the 1980's. Now with a rebuilt carburetor, maybe it will run just a little better, but something is still off. Can you guess the reason for the miss on the #8 cylinder?
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Пікірлер: 164

@Sundance7055 2 жыл бұрын

valve seals are probably leaking through.....was lucky to have 4 vettes in my lifetime am 73 years old now and have a 69.....love the videos Ben

@shadvan9494 2 жыл бұрын

I have never seen a cast iron gm manifold crack. Especially a big block. Those things are practically indestructible. With the tick I would suspect a worn out exhaust cam lobe. It’s not letting the exhaust out of the cylinder #8, so when the intake opens, the exhaust is flooding back in to the intake. Which is where the carbon deposits are coming from.. that’s my 2 cents.

@TRyan-op2jo 2 жыл бұрын

Worn cam lobe, bent pushrod, or pulled up rocker stud would be my guesses. Not a burnt or bent valve. There would be no compression.

@paulmac9634 2 жыл бұрын

The tick is either a lifter and/or could be bent pushrod. Lifter would be from sitting for a long time, pushrod would be from over-revving the engine (maybe by missing the shift to 3rd). Either way you should pull the pushrods and inspect and readjust the valves. On the strange mis-fire that's a tough one and have a similar problem with a small block in a Camaro. In any event, just my opinion, I love your channel Ben keep up the great work!!

@Mark_Hamrick 2 жыл бұрын

Possibility it is a stuck valve(bent or whatever) on the intake side. With the intake valve stuck closed it wouldn’t be able to draw in fuel, so the temp would be lower with no 🔥 burn. It could also be a lifter that didn’t pump up after sitting for a long time or a bent push rod. LOL

@edsel1952 2 жыл бұрын

Had a Buick 455 in our shop years ago trying to trace a misfire similar to yours Turned out to be a flat cam lobe.

@robertjordan3270 2 жыл бұрын

Always happy to see one of your videos in my inbox

@vettekid3326 2 жыл бұрын

When I was redoing a 1985 Corvette I replaced the aftermarket wires, cap & rotor with Delco replacement parts along with AC sparkplugs. The engine then had a miss so I pulled the wires one at a time and found #1 not firing so I swapped the plug with the old one and it still didn't fire so I then swapped the wire and it started running on that cylinder so I put the new plug back in and it didn't run on that cylinder again. Long story short I had a bad new wire and a bad new plug on the same cylinder. Also it was common to see that carbon in the intake runners under the carb from the EGR dumping the carbon from the exhaust especially if the engine had some blow by.

@russellmooneyham3334 2 жыл бұрын

Most likely flat exhaust lobe on #8 exhaust. These engines, (especially the Saginaw blocks) were notorious for having off center cam journals, and lifter bores. As a result, lifters can't spin properly and wipe out camshaft. Which in turn destroys the rest of the bottom end. Also had too little side clearance on rods. So, camshaft didn't get enough sling oil at idle or low RPM.

@repz0611 2 жыл бұрын

Enjoy watching your videos Ben. I own a 2008 Z06 and a 2019 Z06. Watching your videos has me wanting a 69-73 C3. Loved the C3’s growing up as a kid in the 70’s. Keep up the great work 🇺🇸

@allenvaughan1 2 жыл бұрын

Excellent video! Thanks for the tip on testing for vacuum leaks with pliers. Love the '68-'73 rear end. (Hate my '77 rear end--blechhh!!)

@tomschawe2529 2 жыл бұрын

i have a 73 big block i bought new. it sat for 18 years. i fired it up and got the same results. big block chevys are good for dropping valves. i replaced the lifters, push rods, rocker arms, valve springs, keepers, retainers. it made a world of difference. it runs better than it ever did. i would not run that engine like it is. if it drops a valve she's gone.

@Duey333 2 жыл бұрын

Thanks for the videos Ben. I'm always learning something new about these Corvettes, the big block 73's in particular!!

@Steeledawg Жыл бұрын

I really enjoy your work. As an owner of a 1 owner 67 and a 23 z06 c8 I love corvettes this model is the one that got away for me.

@chdurango59 2 жыл бұрын

I don't know! Can You have compression still if the intake valve is not opening on cylinder 8 ? The Knock or tick could be the lifter, rocker arm, bent push rod. Good luck. Ho by the way great videos.

@jupiterjunk 2 жыл бұрын

My dad had (built) four (9 second) Corvettes. He HATED the 454. He'd always pull them, sell them, then get a 427, tune it, then put is in ALL of his Vettes

@discerningmind 2 жыл бұрын

I think there's two issues here. First, is an exhaust valve that's, burnt, stuck-open, cracked. For carbon build-up to be in the first section of the induction system would have to generate from the EGR Valve gases being drawn into the intake. As far as I know that would be a cracked intake. The only other possibility of carbon turning up early in the induction system might be EGR gases entering the crankcase ventilation flow, but any reason for that would be too far-fetched for it to be the problem.

@rubyred93chev 2 жыл бұрын

The LS4 for was a decent yet detuned engine from Chevrolet, sure like the 454 for 1973. Also because it's the only year C3s that had a plastic nose and chrome rear bumpers. These big blocks always baffle good mechanics, with a plethora of vacuum leaks. That said, due to the length of time the car has been sitting (and the car's age), without taking apart the engine, it could be a myriad of things. Looking forward to more videos on this Stingray.