Quote: Sorry, I would have to disagree about the W9's being the same as the GM SB2 heads. A well flowed CFE W8 head is around 420 @ 0.9 lift where a SB2.2 head @0.9 lift has been around 450.
You could go with the Gen3 Apache head it apparently flows 350 out of the box and 400 cfm ported. Sonny stated the hemisphere head is design to be blown. The design makes if a very efficient head. Oh and by the way the Gen3 head is a production head. The only other head for a smallblock that would be better is the P5 and they don't make them anymore. Matt
