What could cause this?

[Travis]

This is out of a 350 small block chevy...





Cylinder still looks ok.
Will need some attention before it goes back together though.

[Travis]

The car started to make a knocking noise when it shifted to second. So to try to keep if from flying apart it coasted to a 9.04 in the 1/8th. I don't think this motor has 1000 miles on it. There are a couple other questionable pistons but other than that everything else seems new. This was in my buddies car when he got it and it has never been sprayed that we know of. Opinions???

[Rosco-Peeko]

No idea......quite interesting tho.

[craigf40]

The car started to make a knocking noise when it shifted to second. So to try to keep if from flying apart it coasted to a 9.04 in the 1/8th. I don't think this motor has 1000 miles on it. There are a couple other questionable pistons but other than that everything else seems new. This was in my buddies car when he got it and it has never been sprayed that we know of. Opinions???

maybe it leaked water into the cylinder through a cracked head or blown head gasket then knocked the water solid

[NightBiker07]

Typical four-stroke.........

[Roostius_Maximus]

how much end-gap was on the top ring?

[Travis]

how much end-gap was on the top ring?

There was only a piece about 1/2 inch long left in it. lol

Never saw the insides before those pics. The replacement parts and machine work, gaskets and getting it back together look to be about $1200.

[Travis]

The guy at the machine shop is blaming the pistons.

They are Keith Black Silvo Lites. They apparently have a bad rep for this.

He said they couldn't get rid of the ones they had and had to send them back.