dstappity

iTrader: (2)

What is the max service spec for a 05 ls2? I have searched and got no solid answer. 10 people say the max is .006 then another 10 say its .060, then another 10 say .030.

I is confused, Can anyone help with some solid, Accurate info on this? I will be turbo-ing this engine.

Thanks in advance.
Daniel

rsz288

Ask a dealer what over size pistons are available. After that which is a solid GM engineering view, everything else is really just an opinion.

topdrop04

im pretty sure its .060 there is car in formula d that has a ls2 built but heintz in nc thats a 6.6

rsz288

Thats a long shot with factory liners.

dstappity

iTrader: (2)

Dealer tells me they only have a .005 over piston available.

rsz288

Pretty much an indicator of what GM thinks works.

Sales4@Texas-Speed

iTrader: (4)

We have seen some people go 4.030" on an LS2 block but that is not something we would ever do because it kills a lot of sleeve. You don't pick up much power at all, so IMO it's not a good idea because it kills the blocks ability to hold big power.

FlamingTA

iTrader: (8)

The common thing is .005 over or .010. GM has the max spec at 4.020. From what I have heard the sleeves are .100-.105. Even at 4.03, which I am doing, you still have thicker sleeves then a stock LS1 sleeve.

On that data I would ask, what are your plans for the motor? If you do big FI or big N2O shot, I would stay at the 4.005 or so spec. Off the shelf pistons are really easy to come by on that bore.

mcdonald77

iTrader: (21)

If I am not mistaken the gm performance parts catalog lists .020 ls2 pistons.