[bob prichard]

I have the 670 heads off of my 1967 Firebird 400, four speed with 3.55 posi diff. The motor is bored .30 over, with stock crank and rods, compression is app. 180-190 psi.

I am wondering if there is any benefit to porting the heads while they are off? They will be getting a valve job. I have a set of long branch manifolds that I can add. Any opinions will be appreciated.

I contacted Butler and they are 8-9 months on turn around for porting, less for a valve job. So, any recommendations (preferably in California) for high quality head work. Thank you.