I have .9mm top second 3mm oil that i am filing to fit now. The date of manufacture was 6/20 .for 4.500 bore. I bet i took over .035 off those top rings to get .024. Total Seal.

Last edited by gregsdart; 05/26/21 06:45 PM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky