My guess is either a wrist pin letting go or as you said a bad rod bearing. I had the crank ground and put in new rods and mains in about 20k ago so I am wondering if one of the Torque to yield bolts broke. Does anyone know if you have to use two sets of TTY bolts one to check rod and main clearences and then a new set when you torque it to put it back together after checking?
I can't tell if it did any damage to the piston so I'm just going to pull it apart and be safe rather than sorry. It doesn't appear that it had been repaired in the past (aluminum heads and block too).
This post was edited by 71ford100 at 12:45:39 01/20/13.
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