I recently bought a LS block with a fresh hone.

When my builder was building the block, he said there was a small scratch in cylinder #2 . He said it's deep enough that you can feel scratch with his fingernail.

He said the cylinder would still pass a leakdown test, but he also said that the compression would be affected in that cylinder, but he did not know by how much.

Has this every happened to anyone before?

If so, how bad was your compression/leakdown effected?

My build is a P30'd Lsvtec, PnP b16 head, skunk2 pro2's blah blah blah.

thx
B

 

if you can feel the scratch then you need a bore!

 

What would happen if I just ran it?

 

well it all depends on how much loss in compression the so called scratch robbs from you, the more the comp loss the more the power loss but we obviously cant estimate

you would be much more happier with a fresh bore and 82mm pistons IMO and if that doesnt take care of it, then you need a new ls block which can be found for cheap anyway.

 

Just get an oversized piston and fix the problem. You know the right way to do it, and the right way is the only way every time.

 

Buy a new LS block or bore it over.....no reason not to at this point. Why chance poor power and burning through oil when you could easily and cheaply fix the problem now?>

 

buy another block they are like 50.00 dude

 

if its at stock bore right now just bore it out to 81.5mm, if you run it with the scratch you could lose compression plus oil will blow by and it could smoke too.

 

Couldn't have been any more right. Spoken with experience and knowledge.

 

Where do you get them for that much?

I'll take 10 of them. LOL.