I assume you checked both the head and manifolds for warpage upon return
from the machinist - this can be a problem. Let your straight edge tell
you. I find that a bead of a sealant (my favorite is Zep Fast Gasket)
applied on both sides of the gasket will almost ensure an acceptable seal.
I'm not sure if the GMC manifolds are the same as Chevs, but I find it
useful to bolt both manifolds to the head with the heat connection loose
(bolts in place, hand tightened, then back off one turn), then tighten the
heat connection last. If there is major misalignment between the two
manifolds, something is wrong. It helps if there are 4 hands to do the job.
I'm pretty sure this is discussed in detail in the archives. You can go
there for the long version.
Good luck.
Allen in Seattle
'50 3100
----- Original Message -----
From: "Boedigheimer" <boedigheimer@stpaultel.com>
To: <oletrucks@autox.team.net>
Sent: Wednesday, September 04, 2002 5:43 PM
Subject: [oletrucks] Intake manifold leak
My 228 was running poorly. The vacum was about 10 inches and I traced
the
problem to a leaky intake manifold gasket. I just put these on when the
rest of the motor got fresh gaskets even though they were not leaking.
Is there a trick I missed putting these on, mystery potion, whatever ?
Thanks
Jack Boedigheimer
1949 GMC 150
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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