hey ed, i'm not trying to start anything with you about the rpm's. but i have dynoed hundreds if not thuosands of big blocks that dont make power anywere near 7500+ rpm's. i guess i'm a little confused on what your saying. are you saying build all big blocks to rev over this rpm's? are you saying all engines worse rpms are 6600-6900 no matter what cam profile or valve train is in it?