what happed to my piston???

[drew]

I pulled the engine, disassembled it and what did i see thissss.

[drew]

has anybody seen this before???

[drew]

sorry, look at lower oil ring landing.

[86Shelby]

Dunno, that's odd. Was the cylinder wall scored? Any debris in the oil pan or oil pump pickup?

[drew]

about where the hole is in the piston , there is a good size groove on each side of the pin a 1/4 way around the piston on each side. it is on the top side of cylinder not up and down the cylinder wall.. . both sides of the piston have the same damage. no debris so far.

[turbovanman]

I can't really see but if its what I think, you either ran lean or heavy detonation.