Thanks Eric....Im assuming you're talking about the port volume?? I thought about that too, but two reasons...first and foremost is Cash! I want to use what I have. Second, I dont want to spend big bucks on aftermarket heads, then mill them down so they will give me decent comp. with my pistons. No one makes a small chamber, big block head. If I start out with something at 100cc or so, Im way ahead. That, and with my nearly 100% street use, I wont be turning big rpms anyhow...and along the same lines, Im going with 2.19 intakes, no need for the 2.25's. Just saved more money, now I can return them.