I bought a 1999 Gen 3 LS from a guy and I found that one over the rollers on a lifter was in the oil pan and I'm assuming this is the aftermath of when that happened. Since I'm getting a 4" crank I'm wondering if this will cause any issues with crankcase pressure/oil getting into the cylinders. It's only about .125 inches deep into the cylinder but still concerning.

 

Probably not an issue. In fact you might find that you have to do more clearancing that that yourself, in a few places. If it's not cracked or anything, just clean it up and move on.

 

You can see where it put debris on the piston skirt, and the piston drug it up the bore. Might need a hone at minimum. Bore doesn’t look round at the bottom from the pic…could be the angle. I’d put a few cup fulls of coolant in that bank and let it sit overnight to check for it being cracked there….or have your machinist pressure check it. Either way, I’d check it before I invested any real money in it.

 

Or, just launch a pre-emptive first strike on it, if you're worried about the possibility of a crack or it looks like there might be: have your local aluminum welder fill it up with metal, then grind it back to a correct-ish shape. Looks to me though, given that the block is probably 3/8" thick or so right there, that it's most likely OK.

 

Its an iron block fwiw

 

Thanks for your input. I have purchased a hone stone tool and am going to do that today to see if i can spot any cracking/warping of the bore.

 

I think you're going to need to grind that out with a sanding wheel or stone or something before trying to hone it. You'll end up enlarging that cyl by no telling how much if you try to do it that way. Just knock it down until it's completely gone from the cyl wall. Doesn't matter if you go a little (emphasis on "little") too far.

 

How is everything going now?