Originally Posted by josh4ku
I am building a 383 stroker, ran for about 2 hours and started to hear a wierd noise, sounded like pistons slap so i pulled the motor back out and actually found the one of the pistons was dented in on the skirt, Found out somebody had knocked that piston off of the bench and didn't tell me about it, Anyway while I had that head off i noticed the cylinder walls seamed to be scored just a bit, But i had only ran the engine for a few hours all together. Just wondering if anyone would know why it would have scoring already. I have molly pistons. top end gap .018 and bottum end gap .021. 850 carburator, seemed to be running to rich.
Sounds like debris as we have used these Mahle pisotns in a few of our circle track builds and after a season of running the cylinders are not marked up at all, It pretty much looks like the pistons never have been up and down in the cylinders.
Was your block plate honed??