I have a 400 with a 4.375 bore, stock stroke 383 crank, 6.800 Compstar rods and Icon 1.475 CH pistons, for zero deck at 9.965 deck height. I'm using a .045 MLS gasket and mildly ported 452 heads(245cfm @ .550), cam is a hydraulic roller 230/238 Erson, and it hasn't been dynoed yet. Compression is 9.2:1. The plan is pump swill. We'll see what happens. S/F....Ken M