the result: the cam was siezed. we had to remove the block plug and hammer it out . The journals on the cam were clean but the cam bearings are scored up. Two of them started to push out as we took out the cam. One exhaust and one intake valve touched the piston on #2 and #8. I filled the ports with fluid and there was no leaks . no bent push rods.
still dont know if the cam siezed then the bolt broke or the bolt broke first .
thoughts ?
I'm sure the cam seized, then the bolt broke. I've never seen a cam bolt break on its own. May want to run the oil pump a minute, and see if the cam journals all have oil coming out. Hard to say why a cam journal would seize to the bearing.