292-6 Cylinder Intake Manifold Info Needed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Coley · 03-18-2019, 04:39 PM

Ok....here we go:
A buddy of mine is redoing the intake and exhaust gaskets on his 292-6 cylinder engine.
Its an '65 GMC 1/2 ton and he has started to put it back together after a carb rebuild.
It looks like it has (had?) a pretty substantial vacuum leak so he thought WTH...he'll redo it and get it right and detail the manifold while he is at it.

My question is...what are the do' and don't's of installing the straight 6 chevy intake manifolds and exhaust manifolds??....assuming the process is probably identical for the 250's and the 292's.

I remember seeing something about this once...perhaps here on the website.
It had to do with getting a good fit and seal for both manifolds so there were no vacuum leaks or exhaust leaks.

If anyone has some insight into this....and some good tips, I'm all ears and i'll make sure my buddy gets the info!!

All good and many thanks
Coley

**PGSigns** · 03-19-2019, 06:57 AM

Just did one on my old 292 and here is what we did. Pulled it all apart and cleaned it good. Put a new gasket between the intake and exhaust and just snugged it up. Put the assembly back on the motor and installed all the bolts and just pulled them up a bit past snug. The we tightened the bolts holding the intake and exhaust together and then the ones to the head working from the center out. No leaks and all sealed up fine.
Jimmy

Husker · 03-19-2019, 10:32 PM

like PGSigns did. Just did my 250. I have no leaks
Ron

03-18-2019, 04:39 PM	#1
Coley Registered User Join Date: Oct 2011 Location: Victoria, B.C Posts: 3,794	292-6 Cylinder Intake Manifold Info Needed Ok....here we go: A buddy of mine is redoing the intake and exhaust gaskets on his 292-6 cylinder engine. Its an '65 GMC 1/2 ton and he has started to put it back together after a carb rebuild. It looks like it has (had?) a pretty substantial vacuum leak so he thought WTH...he'll redo it and get it right and detail the manifold while he is at it. My question is...what are the do' and don't's of installing the straight 6 chevy intake manifolds and exhaust manifolds??....assuming the process is probably identical for the 250's and the 292's. I remember seeing something about this once...perhaps here on the website. It had to do with getting a good fit and seal for both manifolds so there were no vacuum leaks or exhaust leaks. If anyone has some insight into this....and some good tips, I'm all ears and i'll make sure my buddy gets the info!! All good and many thanks Coley __________________ ....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500

03-19-2019, 06:57 AM	#2
PGSigns Senior Member Join Date: Jan 2011 Location: Hayes Va Posts: 4,569	Re: 292-6 Cylinder Intake Manifold Info Needed Just did one on my old 292 and here is what we did. Pulled it all apart and cleaned it good. Put a new gasket between the intake and exhaust and just snugged it up. Put the assembly back on the motor and installed all the bolts and just pulled them up a bit past snug. The we tightened the bolts holding the intake and exhaust together and then the ones to the head working from the center out. No leaks and all sealed up fine. Jimmy __________________ 60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic

03-19-2019, 10:32 PM	#3
Husker Registered User Join Date: Dec 1999 Location: Mid NE USA Posts: 2,212	Re: 292-6 Cylinder Intake Manifold Info Needed like PGSigns did. Just did my 250. I have no leaks Ron __________________ Member #111 68 C-10 Daily Driver 70 4x4 Project 76 Jeep CJ-5 Help Support the Board: http://67-72chevytrucks.com/vboard/payments.php He who knows nothing is closer to the truth than he whose mind is filled with falsehoods and errors. Thomas Jefferson



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