port & polish, any1 did it? Options

[DeW_H0e_GT]

how much gains would i expect from a p&p if any1 did that to their 5sfe?...i was told that it would probably get 10-15hp....but after the fact, would i also need to adjust the valves seeing that engine work was done?

[darksecret]

Exactly why you need to upgrade the intake, port match the manifold and polish the manifold, and add a CAI for the intake side of things, the stock header isn't that bad but if you get the exhaust side done I would recommend it and an exhaust. You won't see boost or nitrous type gains but you increase the volume of air flow into the combustion chamber. A straight port and polish wont net you much gain but if you do the rest it will get you a lot. Also like you said kwanza it determines the design, if you have a head with a low cfm then you'll get low power due to restricted flow, get your head flow tested prior to anything to get a benchmark and see what kind of flow you get after the work is done.

This post has been edited by darksecret: May 10, 2005 - 11:34 AM