How much would I gain by using ported & polished 351w heads on my 302?

5.0fox91lx · 02-01-2005

how much power over completly stock 302 heads would 350 heads milled .40 ported and polished make on a 302 thats also stock but planning alot for it

GTRaptor · 02-02-2005

conservative 25-30hp if thats the only mod, if you have headers, intake, could well be a 40-50hp gain.

It also depends on how good is the port job, the valvetrain used and the final compression ratio.