Rebuilt 235. All machine work done at local shop. Intake manifold has been machined. Still have intake leak. Can I stack gaskets or is there a better fix? Thanks
Did the manifolds get separated from each other during the rebuild? My GMC's manifolds did and when I put them back on they leaked.
My solution was: 1. loosely bolt the manifolds together. 2. install the manifold assembly to the head leaving the bolts to the head a little loose. 3. tighten up the bolts holding the manifolds together. 4. remove the manifold to head bolts leaving the manifold to manifold bolts tight. 5. have the machine shop true-up the manifolds to head surface. 6. re-install the manifold assembly with gaskets and alignment rings.
No more leaks.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
Use a RemFlex gasket. Have the manifolds machined flat while they are bolted together to eliminate any warp. The gasket between the intake and exhaust at the heat riser needs to be replaced anyway, so they should be separated and checked for warp individually. Were the alignment rings used between the intake and the head? They ARE NOT optional. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Well, you have to take it back off to install a new gasket set so you may as well take it to the machine shop to have it trued up.
~~ Jethro 1954 3100 Back to Life In the Dity Gallery 1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020
The manifold has already been machined when together and yes I used alignment rings. Should I take the intake and exhaust apart now even since it has already been machined.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
The manifold has already been machined when together and yes I used alignment rings. Should I take the intake and exhaust apart now even since it has already been machined.
I wouldn't.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
I would install the manifolds without gaskets and find where the gaps are. You may find that when they shaved your manifolds, they took off enough meat to make your alignment rings too long now. A belt sander works well for grinding the rings shorter.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
Justice, What/where was your leak??? Info may help another Bolter should they run into a similar problem.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
Ditto on shortening the rings- - - -they can hold the intake away from the head and prevent the gasket from being compressed enough to seal. The remflex gasket is about twice as thick as the original, which also assures a good seal.
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
You want to make sure that the intake side seals completely. Vacuum leaks can cause burnt valves and, worst yet, burnt pistons. Try finding one only 0.040 over piston for a 235.
1951 3800 1-ton "Earning its keep from the get-go" In the DITY Gallery 1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
