this would be on my stock stroke 65 bore stock cyl set up. the ex is 193. i will haft to look and see what the rest of the # are.. i have ran the wan and liked them in my stcok cyl big bore motor... i was just realy more less wanting to know what some people are doing to the pistons to help out in the end.. not trying to say i want to see it so i can go cut up a set..