Stock GM LS1 parts are equal to the aftermarket sbf parts. I would guess it is the H/C/I that makes it perform so well. I think what is throwing u off is that they are saying "302" which references the block. I am not speaking of detonation limits, but in terms of POWER does anyone know if the BLOCK is made differently on an LS1 to make it more efficient or powerful than the 302 block? Again I am not speaking strength of block, I am speaking in terms of the block somehow makes more power?