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When I install my air gap intake, (73 chevy 350) what difference does the thickness of the gaskets make? Should I use thicker or thinner? (I havent had any head work done, heads are dart 202's.) And should I use silicon? Are hex or 12pt bolts better? Thanks guys!
 

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Make sure intake side of heads are clean of all debris(old gasket material,oil,water,etc.)Clean front and rear rails of lifter valley where the manifold sits on.Place new manifold down onto surface without any gaskets.Check the gaps in between front and rear of manifold along the rail with a feeler gauge.This should give you an idea
 

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I use Gasgacinch from Edelbrock on the bottom sides of the gaskets(What a product,absolutey a Godsend)Then I use black Permatex RTV silicon for the front and rear rails.Place a nice consistent bead along the rails(roughly 1/4 inch)and at each corner where the gasket meets the rail,I give it just a tad more RTV.Sit a few minutes and grab manifold by the dual plane divider and gently place manifold down onto surface in one shot.
 
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