i'm going to take a stab at piston/pin weights. a 2315 will be very close to 1000grms. a stock is around 1000grms. kb162 about 930grms. the last 383 I did had 8:1 cast in it and they were replaced with 2315's. I don't know the weight of those 8:1 pistons. we didn't re-balance, which I would have preferred, but there absolutely was no money so it went together. I was dumbfounded by how smooth the engine ran. actually noticeably smoother than my balanced "properly put together" 440.