i was just wondering if anyone had any numbers for gains they got after doing headwork like valve job mild porting and polishing and milling around .040. im just wanting to get an idea of how much to expect out of it. thanks.

 

I have stage 1 ported heads milled to bump the CR up to 10:1 ready to be installed. I'll have hard dyno numbers sometime this spring. I'm hoping for 20-25 hp and torque.

 

how much are you having them milled? i was told that for every .035 that it would raise your compression 1 point. with the work that im having done im hoping for 25 rwhp. but i dont really know what to expect.

 

My heads are milled .045. Most of that is getting the heads back to stock CR after the porting. Porting took my chambers from 61cc to 65cc (which is why the f-body guys like them as cores). Milling them .045 gives me a chamber volume of 58.8cc, when combined with a .045 gasket, will put me at 10:1 SCR.

What work are you having done?

I'm hoping for the higher end of my guess, but I don't want to be overly optomistic.

 

well im having a good 5 angle valve job, just cleaning up of the intake and exhaust ports and milling them .040.