Less than 2 hours to go and no bids! Look like high compression. https://www.ebay.com/itm/332642957230?ul_noapp=true
when I first saw this, I worked it up (making some assumptions on deck and dome) -with pistons .015 in the hole and steel gaskets, I came up with 11.0:1
Another set from the same seller. 4.312" would be std bore 425. No other specs listed so I don't know if they are stroker pistons or not. $179 buy-it-now......so cheap I'm tempted to buy them just for Christmas tree ornaments! https://www.ebay.com/itm/Mickey-Tho...m=332866298271&_trksid=p2060778.c100290.m3507