Intake porting on a LT4
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Safety Car
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From: Minneapolis MN
Intake porting on a LT4
Is there some HP to be had in the porting of a LT4 intake and how mutch. My mod are a Hot Cam and long tubes and Corsa what about a bigger throttle body? Thanks 
Melting Slicks
Joined: Dec 1999
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From: Austin, TX
There's not much to be gained by porting the intake by itself (I have mine ported and it was a waste of money without getting heads ported as well). Now, if you port match the heads/intake, there's probably a decent amount of power there. LT4's are known for having mismatched intake ports between the heads and intake.
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Originally Posted by redvette6spd
Is there some HP to be had in the porting of a LT4 intake and how mutch. My mod are a Hot Cam and long tubes and Corsa what about a bigger throttle body? Thanks
Safety Car
Joined: Sep 2000
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From: Hinckley Ohio
Originally Posted by redvette6spd
Is there some HP to be had in the porting of a LT4 intake and how mutch. My mod are a Hot Cam and long tubes and Corsa what about a bigger throttle body? Thanks
There is a factory mismatch between the intake port, head port, & intake gasket........especially with the hot cam you need to do port matching of the intake & head to the GM....777 intake gasket plus port the heads and 3 angle valve job.......you should see a nice gain from this....
I would go to 58mm throttle body, but you must open up the intake manifold to 58mm.....
