guy_from_nerk

My buddy recently picked up a c5 block to start building for an NA setup. Today we took a mic to the cylinder walls to see what bore the block was (previous owner said he wasn't sure). This is where the concern comes in, I am wondering what the limits on stock sleeves are and also wondering if this block has been re-sleeved.

Here is the measurements we got from the cylinders:
Cylinder 1: 85.25mm
Cylinder 2: 85.41mm
Cylinder 3: 85.36mm
Cylinder 4: 85.44mm

No 2 cylinders were the same bore and the .19 variance between 1 and 4 has me puzzled. But it doesn't end there...

Here is some pics of the block, it has a block gaurd in it, but appears to be stock sleeves. I have never heard of a machine shop willing to bore stock sleeves out so big. I talked to a couple engine builders and they said stock sleeves should stay 81-81.5mm with 82 being the limits. After that they suggested the block be sleeved.

raverx3m

iTrader: (1)

those are not stock sleeves

the outer sleeve connects on the 1.8 blocks the only one i know that doesnt is b20 block

its been resleeved

raverx3m

iTrader: (1)

and that tool is not exactly right tool to measure cylinders

Mach1n1st

Looks like a replacement dry liner was installed not knowing the make of liner I cannot say weather or not it can be sleeved again with a closed deck sleeve. Only other option is to remove those sleeves and reinstall another set but that is pretty difficult because no one knows the quality of the first install and how it was bored after the install. At this point I would look for a new block.

guy_from_nerk

Yeah I believe it has the lines in it as well. We're gonna stick a dial bore gauge in it and go from there. Since it's an all motor setup with some sort of aftermarket sleeve structure, I don't feel worried about going 85.5-86mm on the bore. If it were stock sleeves then yeah, a new block would be the route I would tell my buddy to go as well.

DDTECH

Have a machine shop straight em out.

guy_from_nerk

Yeah, it will be going to a shop before any further steps are taken in this process.

raverx3m

iTrader: (1)

what crank are you gona use? 89mm crank gonna put a lot more load on sidewall than stock itr

guy_from_nerk

Most likely an LS, here where we live in Ohio it's near impossible to find a good condition GSR/ITR crank but LS cranks can be found for $20 daily

bigpunn421

i never liked those drop in block guards. thats what it looks like from the pics