Originally Posted By fast68plymouth
Possible causes?

It was in the pan from the previous freshening, or it broke this time around and ended up in the pan.

Sometimes they break....... stuff happens.
iagree
The motor is talking to you saying it is broken, time to find out where and why up
OP, you need to take the pistons out to find which one is broken and then figure out why it fail to make sure it doesn't fail any more of them scope
I've had pistons that didn't have enough end play on the spiral locks so they would seat completely in the machine grooves puke scope
Most piston makers want from .0010 to .0030 end play at room temps with no oil shruggy My thinking on this is that a lot more(.003+) clearance is better than a tiny bit to little, less than .0009 work

Last edited by Cab_Burge; 01/21/19 03:49 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)