blow my head gasket. pulled the head off and this what i seen on piston #1. before pulling head did compresion test 150 on 1 and 160 on 2,3,and 4. is water or was i knockin. it looks what happens when water droplets falls on sand or snow.

looks like something was in the cylinder and the piston and head took a little beating from it.

Looks like something got in there and banged around.

That is detonation. There is a chance that it continued down the side of the piston (on the side that looks "cleaner").

Mb

Detination 100%

didn't know had to find out before moving on. replacing it is what you suggest.

kongo said:

didn't know had to find out before moving on. replacing it is what you suggest.

Click to expand...

On a stocker, I would pull the pistons and look for any wear on the sides. if there wasn't any, then I would clean them up and reuse them.

BUT on a stocker that probably wouldn't happen. On your set-up I would replace (obviously, forged is a lot less likely to do that).

Not saying you HAVE to do it. Just what I would do. I don't like hot spots and changing weights on pistons (if you clean it up, you will lose some weight) when you are running more than stock.

MB

Got it