C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Porting Intake

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Old Jan 21, 2009 | 10:29 AM
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From: Victoria
Default Porting Intake

I have a spare intake manifold for my 89,and although there does not seem to be much material that can be removed,should I gasket match the whole manifold,or just the runner to manifold ports??
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Old Jan 21, 2009 | 05:05 PM
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Have you considered the siamese manifold mod?

In any case gasket matching, where possible, would be a good idea to aid air flow.
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Old Jan 22, 2009 | 06:46 PM
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From: Victoria
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Originally Posted by 65Z01
Have you considered the siamese manifold mod?

In any case gasket matching, where possible, would be a good idea to aid air flow.
Thanks,I have viewed the siamese manifold mod.
and understand how this would create better air flow,but dont understand why the makers of aftermarket intakes dont sell them siamesed or is it because their ports are already enlarged?
Also the head to intake are these ports also gasket mathked??or better left alone.
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Old Jan 22, 2009 | 07:00 PM
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I bought an SR and it came with a stock base totally ported out, they claim 30 hours of port work, it was kwik88's. It is really opened up a lot
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Old Jan 22, 2009 | 07:37 PM
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Originally Posted by Qiken
Thanks,I have viewed the siamese manifold mod.
and understand how this would create better air flow,but dont understand why the makers of aftermarket intakes dont sell them siamesed or is it because their ports are already enlarged?
Also the head to intake are these ports also gasket mathked??or better left alone.
If the intake is larger then the head then port matching will gain a bunch of flow, if the head is larger then the intake then the port matching won't show nearly the gain. Match the ports, not the gasket, but do make sure the gasket doesn't stick into the air path.

I took a few pictures while working on mine, click on my Corvette pictures under my avatar to the left.
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