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redline · **Posted:** Thu Feb 18, 2010 4:06 pm

I'm slowly collecting pieces for my b18a1 build I plan on boring my motor to a 2.0 that's .20 right??? My question is would I need to sleeve it? I just want a bump in compression, torque, and power no nos it will be all motor. My head is done simple pnp, buying skunk2 valve springs and retainers crower cams with aem adjustible cam gears and over sized itr pistons stock ls everything else b16a1 tranny but with my ls 5th gear. I have a 2.5" n1 exhaust from eeebaayyy. With all I have and still tryin to buy do I need to sleeve this and does this all sound legit?

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Integraguy04 · **Posted:** Fri Feb 19, 2010 3:22 pm

there is a difference b/w a 2.0l motor and boring it .2

redline · **Posted:** Sun Feb 21, 2010 3:06 pm

Ok I didnt kno that. So would over sized itr pistons fit without sleeving the block?

Integraguy04 · **Posted:** Sun Feb 21, 2010 4:58 pm

yes... i dont remember if oversized are 81.25mm or 81.5mm bore but yea you would just have to get it bored out a little bit (.02in = .5mm)

redline · **Posted:** Mon Feb 22, 2010 10:21 am

Oh ok thanks for clearing that up. the pistons I was looking at was 84.5mm. If I would have to resleeve the block I'll go wit 81.5mm, Thanks again for the info.

Integraguy04 · **Posted:** Mon Feb 22, 2010 12:00 pm

you dont need to re-sleeve the block...just have it bored out and honed according to the size piston you use

redline · **Posted:** Tue Mar 02, 2010 12:15 pm

Thanks alot. Once she's apart I'll post up pics.

redline · **Posted:** Tue Mar 02, 2010 12:16 pm

How do I post up pics :quoi

jdmBuilder · **Posted:** Tue Mar 02, 2010 1:49 pm

if you plan on going with the 84.5mm deff sleeve and if your going with the 81.5 i would at least install block guard, you don't wanna make those cylinder walls to thin or they will start flexing on you

redline · **Posted:** Tue Mar 02, 2010 2:32 pm

jdmBuilder wrote:

if you plan on going with the 84.5mm deff sleeve and if your going with the 81.5 i would at least install block guard, you don't wanna make those cylinder walls to thin or they will start flexing on you

Thanks for additonal info. so unless I use stock pistons I would need to either sleeve it or use a block guard? Where's the best place to find either or?

jdmBuilder · **Posted:** Tue Mar 02, 2010 4:39 pm

A lot of brands make block guard kms, supertech, golden eagle.. take your pick. when it comes to the sleeving i personal am using Darton, it runs around $580 for the sleeves and then the cost to have them installed you can go pretty much anywhere from 81-87mm i believe.

Integraguy04 · **Posted:** Tue Mar 02, 2010 8:32 pm

if you are going to use a block guard, make sure the machine shop puts the block guard in before they do any work on the block because if they do it after it will make the cylinders "egg shaped"

redline · **Posted:** Wed Mar 03, 2010 1:02 pm

81.5mm with a block guard it is. Thanks guys.

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