I'm guessing this is an engine you got from a junkyard or from a car that had sat for some time? It's a perfectly natural thing; over time, moisture rusts cylinder walls in an engine that hasn't run for years. The side effect is that it will definitely need an overbore (if they get the pistons popped out), and maybe a .040" as opposed to a .030" depending on the severity of the rust.
no, engine came out of my car, running about a month ago, had a blown head gasket... thats what is weird about it.. sealed power pistons, bearings were stamped in 98, so i would think the rings were 98 too... could overheating do this? im confused.. standard bore pistons..
Bingo. When your head gasket went, chances are a good deal of coolant sat on top of one or two of your pistons for a month while the car sat. Wouldn't think it would have gotten that bad, but without seeing it I can't say much.
no coolant standing in cylinders, tore it apart in a week or less, didnt take long.. cylinder walls look fine no rust, my dad talked to him, i did not... so it could be that the rings are froozen to the pistons...????
good question, im really quite baffled myself, i will drop by tomorrow to see what he is talking about exactly, because my dad sometimes gives me slightly different information... so what type of pistons are sealed power? forged?
When I pulled my 89 motor apart about a month ago I found 6 pistons in which the oil control rings were frozen in the ring grooves... This was just due to carbon build up... i work for a Chevrolet dealer and we see this a lot on Gen3 V-8's...