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Old 01-21-2003, 03:48 AM
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Post SBC Intake manifold fit - best way?

I'm about to bolt up a Performer manifold to my 350 crate SBC, but not sure what is the best way to ensure a perfect seal - some say lose the rubber end seals & use silicone instead, others coat the surfaces with liquid gasket etc etc - what works best guys??
Many thanks, Limey Simon

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Old 01-21-2003, 04:35 AM
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Hi Simon,
I'm of the lose the seal and use the silicone. The rubber ones work fine if you apply them correctly, but I just think the silicone method is easier and more foolproof.
Make sure the bonding surfaces are absolutely clean. Use carb or brake cleaner. I like to follow that up with acetone.
Apply thin layers of silicone to both sides of intake gaskets around the water ports only, not around the intake ports. Put them in place on the block.
Apply a 1/4" high bead of silicone across the front and aft block surfaces. Add a dab more at the end of each bead where the heads meet the block (not so much that it blobs into the lifter valley). Allow the silicone to "skin up" for about fifteen minutes, then very carefully put the manifold on straight down, trying not to smear the silicone around. Add bolts, torque to spec. Sit back, pop a top and plan your next move.
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Old 01-21-2003, 05:37 AM
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Thanks Busted K's - so you mean the gasket goes on dry? (apart from round the water ports?) I'm sure I've seen people use something smeared on the faces?
Cheers, Limey
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Old 01-21-2003, 05:48 AM
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I suppose you could smear sealer all over the gasket, but it really doesn't do you any good, and it's a lot easier to deal with if you should decide to try another intake or swap cams or something. Less scraping, less cleanup. If the parts fit together correctly in the first place the dry gaskets will seal judst fine.
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Old 01-21-2003, 01:56 PM
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If you "dry fit" the intake with the side gaskets in place, you can get a feel for the amount of sealer you'll have to use on the ends. If the heads and intake are new, you should be able to use only sealer. I've had mismatches where the gap was too large for just sealer and had to resort to the rubber ends...and sealer! The Law of Nature is if you're going to have any leaks, it will be in the BACK of the intake!!
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Old 01-22-2003, 02:19 AM
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I am also from the lose the seal school. cut the heads off two longer than necessary intake bolts screw them into the cyl head and use them for guides to slip the intake in place. on opposite sides of course.
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