I'm a new guy on here. I hope you'll overlook my errors. Having never built a 250 Chevy before, I have a lot of questions. I've been following this sight for some time and never posted anything. Now for one question--Has anyone on here ever tried to adapt 318 Mopar pistons to a 250? Their bore is 3.90, which would be a .015 over bore for a 250. The comp height is 1.658 to 1.741,depending on the 318 bore. The pin height is the manufacturers method of compensating for a compression increase when over boreing. These pistons are available in a flat top with no valve reliefs, and no extreme chamfer around the top. The only drawback I can see is the pin dia. is .057" larger than the 250. I am going to have the rods resized and shot peened any way, so my other questions are would the enlarging of the small end of the rod hole for the larger pin weaken them too much, and how much room is there to play with on the piston height?
