I was wondering what the max bore would be on a LS6 motor with out resleeving. I just purchesed one and wanted to hone it as much as I could since their was a scratch in one of the cylinders. I was thinking it's somewhere around 3.905-3.907, if that's the case I would only go 3.903 so I could hone it again if I ever needed too.

 

i wanna say 20over?

 

So 3.905 or 3.907 would be no problem right? Stock is 3.898 or something right?

 

Dont hone as much as you can, hone as much as you need to. Most aftermarket pistons are sold in 3.903, 3.905, 3.908, and 3.910.

 

Its .010 over to be safe.

 

Well I bought a block from a guy who poped his motor in a Z06 (c5) and he said the cylinder was scratched but not to badly. I wanted to get the pistons before I take it to the machine shop since they are supposed to hone to the specs of the pistons. But I would hate to buy pistons and the guy to look at me like I'm an idiot cause they aren't going ot fit after the hone work. I was thinking about going with a 3.905 since that is quite a bump from stock and it would still give me some room to rebuild later. I hope that's enough.

 

IIRC...it's 3.905 max

Hammer

 

Careful there with that block. I had what looked to be a small scratch in mine, and it turned out it was a crack! I couldn't tell a differance, but I took it to a reputable machine shop and that is what they told me.

 

Thanks for scaring the crap out of me!!! I already bought the block and now I have to worry. At least I got a good deal on it.

 

I bought a LS6 block had it cleaned and looked at then had it honed to 3.905 and installed Mahle -4cc 3.905 pistons. Everything has been going great thus far, I have put about 10,000 miles on it and no complaints.

 

LOL sorry man. Better to find out now tho then when you start building it up and paying for machine work! You'd be best off to take it to a machine shop before you buy anything and have them check it out. If it turns out it is just a scratch, then ask them what they think you can get away with honing. Tell them the standard size pistons that are available and ask them which size to order. Don't have them do the machine work yet tho, just have them measure it. Most shops will do this for free. Once you order the pistons, have them measure the pistons and then have the machine work done. Thats what my plan was anyways. But since I had a cracked sleeve, it turned out to be cheaper for me to just order a complete assembled shortblock from SDPC rather than building a new one from scratch. Good luck with it all

 

The maximum safe overbore is 3.910. Per numerous books and service manuals.