Join Date: Mar 2002
Location: Austin, TX, USA
Some GM heads like the heads off a 97 firebird TPI motor, can be machined for larger valves, deeper spring pockets and ported for about $400 a pair (at a place near Ft. Worth, TX anyway). Otherwise the aftermarket is hard to beat in terms of performance vs. cost. Just know your valve lift goals before you choose a head. Also don't be fooled by bigger is better on port volumnes. 190 to 200 is about tops for the street. Otherwise, charge velocity slows down and you loose the Ram affect. High lift, minimal shrouding, and large valves combined with a reasonably sized port volume will really perform well. Chamber volume is highly important to the compression ratio. So match the chamber volume with the piston type, deck heigth and gasket thickness. Jegs and Summit are good places to shop the aftermarket.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI