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Old 05-31-2012, 04:29 AM   #49 (permalink)
oil pan 4
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All is not as easy as it seems.
The HMMWV manifolds require a odd sized 2.618'' (about 2 and 5/8'') compressed doughnut/ball/mushroom gasket, not 2.5 inch like I had originally thought.
The part number for the HMMWV manifold gasket is:
EDIT the correct GM part number: 15035747 appears to be close enough
Data page for the real part.
http://www.dlis.dla.mil/webflis/pub/...9738&newpage=1
The GM parts web site says they can get it for $20.

I think that gasket will fit a 2.5 inch 6.5T OE style pipe close enough. If not I am sure I can make it fit.

The banks manifold does not use the OEM style gasket.
I believe it requires a 2'' header collector flange with a 2 inch pipe. I don't know where to get a 2 inch header style flange so I will just have to make one out of the old pipe.
EDIT: I was able to convert the OE style flange to a flat collector style flange very quicly with nothing more than a hammer and it looks really good.
I will hand cut a copper gasket for the banks since sourcing gaskets is proving to be very time consuming.

The cross over pipe is a little more than half way done, but I am out of good 2 inch pipe and I don't want to use the crinkle bent stuff they have at advanced auto and auto zone.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
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Last edited by oil pan 4; 06-13-2012 at 05:31 AM..
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