commando's vs. eddie rpm's

I agree I need more compression.....one of those things if I knew then what I know now I would have done it differently and bought different pistons.....but the motor runs for what it is. As far as the heat dissapation theory....I have been doing a lot of reading on that and it seems there is a consensus out there that is BS now with the types of aluminum being used for heads now. They have more density and are holding the heat in like the cast iron heads. Heard anything about?