[undy]

It looks like your thinnest cylinder after an 0.080" bore (4.13") would still be a little over 0.11x". A lot a people say to look for 0.100" minimum thickness. I like to see a little more (0.125"). Some of your thinner measurements are on the thrust side of the piston, not a good thing. I know that there's something mystical about the "428", for bragging rights. I'f it were me I'd go for a 0.40" overbore, stroke the snot out of it (4.25") and go fry some hides! ....and best of all, feel good about the nice thick cylinders that's maintaining proper piston geometry and an engine that's not boiling over at every red light..