pound for pound - and I mean that literally - if you have the $$, go aluminum... even if you could get the exact same performance #'s out of both, the 915's are heavier - and we all know the formula for going faster
Totally agree. I guess my issue is, it will be a while before I finish the other motor and ill want to get the best set of cylinder heads for my build.
I guess I was kind of thinking depending on cost of freshening up the 915s I could run those on my low compression 440 that's in the car.
