Alleycat. Straight 8 piston have .005 cam grind that's it. If you use new pistons with .010 you should knurl both sides of the skirt. Preferably half point from center of skirt to the edge looking at the piston from its side. Dnt forget when replacing cast piston with aluminum pistons clearances have to be for the new pistons. I have a vintage knurler that was use on inline engines while they are in the chassis. Booklet says to do the same thing to quiet piston noise. So you can give those blanks a .005 grind or knurl the pistons where I said. I have had good success with the knurling. Keeps more oil on piston surface.