Why Not A 300hp NA Stock?

[Supra_Freak_7m]

If you were to run a 7m to 8k you better pack your pistons with parachutes so you can catch them on the way back down. The problem with that in relation to a 7m is piston velocity and with it tensile load on the connecting rod. Piston velocity is already very high in the 7m to the the various revisions in the M block being bored ( thus adding a heavier projectile) and stroked (incresing piston velocity) so many times that it is very near it's physical limits. Keep in mind that connecting rod tensile loads increase with the differance in rpm squared, meaning that the difference between 6000-7200 would yield a 144% increase in tensile load. so going up from 6400 to 8000 is a 256% increase in tensile load to the connecting rod. That is why it wouldn't work specifically with the 7m, However, on a more modern engine it would be possible. Though I think a lighter forged piston and a larger bore but shorter stroke would be the way to go