Post by
Nathan »
https://forums.nicoclub.com/nathan-u5605.html
Tue Sep 23, 2003 12:22 pm
Well hot darn, my engine is in the process of being bored .020 over also. What a coincidence! Haha, it's not all that usual to find other Nathan's, welcome to NICO!
Edit: according to Swain Tech the poly moly coating is .0007 thick. That's 7 ten thousandths, thats tiny! Generally when you are deciding how much piston to wall clearance to run it is to the thousandth. For instance, if you wanted to run 4 thousandths clearance and your piston was 3.500 inches in diameter you have the block bored and honed to 3.504 inches. Well with the poly moly coating on your pistons you would lower the clearance by .0007 inches all around, making your piston 3.5014 inches in diameter, which isn't very much considering it's a lubricating coating that according to Swain Tech is a "slippery coating works in conjunction with oil to provide an extremely low coefficent of friction, reduce piston scuffing and extend cylinder bore life."