This is me texting my engine builder my 403 lasted maybe 3hours.








I believe pistons are cast.

 

https://classicoldsmobile.com/forums...-8-cyl-156143/

part one

 

Fire that SOB now. He's a hack.

 

What an Ahole. This is shitty, he fucked something up. My guess due to the marks on the pistons is not enough piston to wall clearance and fucked that cylinder. If he likes things tight maybe too tight on bearing clearances or the block wasn't properly cleaned out and bye bye oil pressure. Talk to the shop where you did the dyno, to get it fixed. Curious what power did it make?