intake manifold gasket
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Senior User
Joined: Oct 2006
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From: las vegas
intake manifold gasket
I have a 351w from a 79 E-100. I don't know why, but I changed the intake manifold gasket. Good thing i did, it was prett shot. After i changed it and got it all torqed down I drove it home. I went to the store the next day and found a HUGE puddle of oil in my driveway. After searching where it could have come from, I noticed the rear cork piece of gasket was not underneath the intake manifold. It was fully exposed. Do you guys think that is where my oil is leaking from? I need to get it back in. If I just loosen the bolts can I lift the manifold and slide the gasket back in? Will I have to drain the radiator to do this? Thanks in advance guys. 
Cargo Master
Joined: May 2007
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From: British Columbia
Maybe you can clean the gap really well with aerosol carb cleaner or similar, then lay a bead of silicone in there. Don't put so much silicone in that it drips inside the lifter valley and then gets into the sump.
Senior User
Joined: Aug 2007
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From: CANADA
Ive always just used silicone with no gasket and it works great, but thats on 302s with aluminum intakes so I dont know if it would work in your situation. Ive seen guys peen the gasket sealing surfaces a little too, it helps hold the gasket or silicone better. Clean the area well and make sure to torque to spec and do it evenly.
Cargo Master
Joined: May 2007
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From: British Columbia
Yes, it's advisable to drain enough coolant so the level is a couple inches below the intake manifold. Otherwise the coolant will spill into the lifter valley when the coolant passages in the intake manifold to heads are separated.
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get a new set of gaskets..... you just can't lift the intake a little and sneak the end seal in, good chance you will rip the gaskets. Throw those cork gaskets away and use some rtv... the main thing you have to do is clean the block and the intake real good with laquer thinner before you lay a bead down..... cut some 5/16 threaded rod about 6" long and thread them into all 4 corners of the heads...use them for guides as you slide the intake down them to meet the heads....I have done this 50 times ..never a leak... just clean it real good and that rtv wont go anywhere....
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Joined: Jun 2006
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From: Ottawa, Ontario
The old 302 I took out of my truck was leaking from the rear intake gasket as well. The trick I heard about to prevent this is to glue the front and rear cork pieces to the block with contact cement, and then RTV between the intake and gaskets. I did this with my 5.8 and it has never leaked.
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Joined: Oct 2006
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From: las vegas
i guess the trouble we had, was we were doing this in the truck. The intake manifold won't go straight on. We had to go down and back, then we could go forward. I guess that is when we slid the gasket back. Man does that cast iron weigh a lot.
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