Hey i pulled the head on my s2k and i believe there was some detonation in my s2000 before i purchased it. Ive been driving for a good time no cel and no “knocking”. Which is why i think it happened previously and not while i have been driving. Im going turbo stock block headstuds and valvetrain upgrade do you think i can reuse this pistons. My cylinder walls look fine

 

I see normal carbon build up, not detonation

 

Ok. Sorry for the noob question then first time around the block literally lol so i should be good to send it then

 

If a cast piston sees heavy knock... you wont have any ring lands left LOL

On a 2618 piston, you will see dimples from detonation, you wont see this on a cast piston, just cracked ring lands lol

Like what chibo said, just carbon build up from pump gas.

 

Cool thanks man!