Nice chart Denny

For normal street oem type stuff buils---------rule of thumb is .004 per inch of bore size-so usually .016 ( 4.00 bore ) to .018 ( up to 4.500)

Special pistons have unique heat flow paths and generally ring/ piston manufacture will have specific breakdown of gap ranges for usage of engine-----!~E--- A Nascar 9000+rpm will have different gap than a 2 kids in the back seat sedan/wagon