Newb with a crank question
For starters, I have a 385ci SBC in a 72 Chevy SWB pickup and I have decided to apply some form of boost (probably a centrifugal supercharger). I am, however going to have to upgrade my rotating assembly to do so. I have found a heck of a deal on a 4140 forged kit with h-beams and 9:1 forged pistons. I have also found a similar 4340 kit that is about $600 more than the 4140, with the same pistons and rods. It will be a street truck with 10-15 psi boost, running below 6000 rpm. So, the question is 4140 or 4340?