heads, how much hp gain??

[jim_howard_pdx]

These should get you 25 to 35 hp. I went to the twisted flow trick flow aluminum heads. I gasket matched the intake to the head using a ported version gasket. I now push 414 hp from a 30 over 351 Windsor, and I was getting 315 hp when running these heads on a 289.

I love the low end torque, and I love the high end acceleration. The only downside is that I tend to tear up the intake gaskets and then suck them. I get clouds of white smoke about once a year, but the intake gaskets are cheap, and fairly easy to replace on a 66 stang. 400 hp comes at a sacrifice.

If you go with iron heads, you will have less gasket failures, but it will ping on pump fuel unless you kill the compression. I have 10-1 compression and can run base regular fuel without pinging.

Try these heads if you need cheap. If you want to tear up the boulevard, the trick flow kick butt!