Cylinder wall thickness

4.375 on a 400 is .035 over! If everything mags out you won't have anything to worry about! Plenty of wall on that puppy! A 470 is a sweet combo! Your gonna love it! The only down side is.......Your gonna want more! Lol Stroking can become addictive! Good luck my friend. Shane

seriously, correcting for .002 of bore?

You realize a piece of hair is .003-.006?

The nerve of some people's kids.

Brian