bowtieman81

iTrader: (35)

First off, I searched quite a bit and didn't find much useful, which is surprising since somebody else must have had this issue.

Anyway, I am doing a heads/cam swap on my car. The engine is stock internals. Got the heads off, chambers look good, piston tops look good. But, on 4 of the cylinders (#3, 6, 7, 8) I have some scuffing of the wall. All of the scuffs/scratches run up and down the cylinder (parallel to piston travel) and most of the scuffs are around the 6 o'clock position when looking at the engine from the top. These scuffs are enough to fell with a finger nail. They also seem to be kind of high on the cylinder to be the piston skirt, seems more like the rings may have done it but I am not sure.

My questions are:

1. any ideas as to what caused these scuffs (lack of oil, dirt ingestion, etc)
2. The more important question, what should I do about it?

Thanks, Pete.

Rebelord

iTrader: (2)

sounds like the scuff marks from piston slap. I havent seen them myself, but seen diagrams of what it would be. I am about to pull my heads off also and hoping that it isnt bad for me. The site about piston slap is: www.pistonslap.com someone correct me if I'm wrong.

Ski

Reckless

iTrader: (9)

Could be piston slap. If it were ingesting dirt or something through the intake it would likely show in all cylinders, so it seems more likely to be mechanical.