Porting power gain?

[Kreb]

My build: 3.4 w/ ARI stage 2 cam, 1.6 roller rockers, headers, Holley 390, Torker II. Three angle. If I follow the porting guidelines in this site's info pages what sort of increase can I expect?

[donk_316]

What are you porting? The only 'porting' info i can find here is on gen3 heads. You dont have those. You gonna open up the intake manifold?

[Guest]

I would guess he means the heads. I say by porting them out I say maybe 10 hp or so. YOu aren't a professional so I can't assume that great of a job. Concentrate on the bowl areas. you will see the most gain there.