im just about to start the build up of my b20 in my LS. i plan on running a decent amout of boost (about15-18psi). i've been told by several people that a b20 can handle that on stock internals. i've always felt that at least forged pistons would be the way to go. this is my first turbo build and i dont want to be walking a thin line between boost and break. any input or past experience would be appreciated

 

b20 sleeves are very weak

 

Sleeve it and do the con rods and pistons while you're at it..
I've heard some people running boost that high but heard of major breakage from others..

 

thats just a myth. no plenty of people running 15 pounds with no problems.

 

i know of them too..

 

it will not hold together long with stock bottom end, maybe a few months

 

tuning is key

 

hows tunning going to keep the cylinder walls from moving, or the rods from all the pressure, tuning will save the pistons

 

like i said tuning will be key......

ask shad or steve sakai, best 2 tuners in the area. ive seen crazy numbers on stock blocks thru the both of them and all seem to be reliable. plus crazy numbers from steve sakai on really high compression na motors daily driven.

so stick to your probe....

 

seems to be a split crowd