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Old 07-20-2008, 11:17 AM
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Intake manifold exhaust connection

I am fitting a Weiand Stealth intake to a 351W fitted with GT40 aluminum heads. There is an exhaust passage half way along each head mating surface which lines up with holes in the intake - should these be closed off by the gaskets, or left open? If there's a choice, what should I base the decision on?

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Old 07-20-2008, 11:22 AM
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Quote:
Originally Posted by rsk289
I am fitting a Weiand Stealth intake to a 351W fitted with GT40 aluminum heads. There is an exhaust passage half way along each head mating surface which lines up with holes in the intake - should these be closed off by the gaskets, or left open? If there's a choice, what should I base the decision on?
They're to help warm the intake in cold weather and keep the fuel from puddling. For a strip car I'd say block them off with the gaskets that have the metal piece made in them. If you use just gasket material it will burn through in no time.
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Old 07-20-2008, 11:33 AM
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It's a purely street car, - I don't have a problem keeping it warm! It has to sit in traffic a fair bit, so maybe better blocked off to stop overheating?
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Old 07-20-2008, 11:46 AM
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The UK is rarely hot, rarely real cold.

My initial reaction is to drill a 1/4 inch hole through each block off plate.
That aluminum intake will pull some heat from the lifter valley also.

Just a thought.
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