Gains on porting heads
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Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Re: Gains on porting heads (Prufrock17)
No enough info :(
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Re: Gains on porting heads (mackeyred96)
I depends on the head and how the engine is setup. A modern head with a mild cam will be pretty good out of the box and porting gains may be minimal and not worth the cost.
A vintage head with a street high performance cam will usually yield a 5-10 percent improvement in top end power, with measureable gains starting at the 3-4000 range.
Full porting isn't worth much on the street and can hurt the bottom end, but "pocket porting" - cleaning up the area just upstream of the valve and matching the head ports to the manifold is worthwhile and has zero cost because it's easy to do yourself.
Duke
[Modified by SWCDuke, 9:21 AM 5/12/2002]
A vintage head with a street high performance cam will usually yield a 5-10 percent improvement in top end power, with measureable gains starting at the 3-4000 range.
Full porting isn't worth much on the street and can hurt the bottom end, but "pocket porting" - cleaning up the area just upstream of the valve and matching the head ports to the manifold is worthwhile and has zero cost because it's easy to do yourself.
Duke
[Modified by SWCDuke, 9:21 AM 5/12/2002]
