We had a street car many moons ago with that kind of wear. Went through two engines before we actually found the problem... Bad Clutch Pressure Plate. Required way too much force to overcome the spring and was transferring this force to the thrust bearing. We didn't really know there was a problem until the car wouldn't start and blew the dents out of the oil filter, then oiled down the driveway! Metal and bearing material got into the oil pump relief valve...Oil pressure spiked, blew up the lifters, held the valves open and Taaadaaa... no compression, but a hell of a lot of oil pressure!
My guess is that it had nothing to do with rebuilds, or what bearings were used...most likely the car was driven for a while with a bad pressure plate.
Good luck!
Dave Frieder
MGP Racing
Buffalo, NY
Bookmarks