Head Comparison

[Pacino]

Mike, I have a set of sportman II heads on a 406 sbc w/ nos, that flow .300/.210. My question is, would their be a signifigant gain in et if I went to a head that flowed around .310-320? I need to stay with 23* setup also. I guess what I'm asking is how much hp/et gain would their be if any? Thanks

[Mike Stark]

I would say you would gain in two aspects. Much needed volume and additional flow. You would see a 20 to 40 HP gain depending on the rest of the motor.