What is the size of a Chrysler 318 bored 040 over?
A Chrysler 318 cubic inch engine's stock bore is 4.00 inches. Boring it .040" over increases the bore to 4.040 inches. The stroke remains the same (3.31 inches). Therefore, the displacement increases slightly, but it is still considered a 318. The exact displacement with a .040" overbore would need to be calculated using the formula for the volume of a cylinder (πr²h) multiplied by the number of cylinders (8). The result will be slightly larger than 318 cubic inches, but only marginally.