OK, turns out what I thought was a 402 engine, really is a 454 block (casting no 3999289). Evidently maybe the factory ran out of 396 or 402 blocks, grabbed this 454 block, and only machined it for 402 use. I had the cylinder wall thickness sonic tested, and there is plenty of meat there to support a 454's 4.25" bore. Since it really is a 454 block, there is also enough to support a 0.030 and 0.060 overbore later if needed. If I can find a reasonably priced 4.00" stroke crank, I think I'll go ahead and reassemble it as a genuine 454! /forums/images/graemlins/cool.gif Who out there has a 454 crank (cast or forged) in good shape cheap?