02 Camaro

iTrader: (5)

Im just looking to find the size of the piston i need to put a 402 rotating assembly into an ls2... easy noobish question so any help is appriciated

litle88

iTrader: (20)

That will depend on a few thyour bore

litle88

iTrader: (20)

That will depend on a few things bud, how much compression do you want to run? Are you going big cam? F/I, do you want valve reliefs, but your machinist should be able to tell you what size and what kind of piston to use.

bww3588

iTrader: (49)

A 402 will use 4.00 pistons and larger according to over bore. I believe they use a 1.115 compression height as well.

litle88

iTrader: (20)

That will depend on a few things bud, how much compression do you want to run? Are you going big cam? F/I, do you want valve reliefs, but your machinist should be able to tell you what size and what kind of piston to use.

bww3588

iTrader: (49)

Re re repeat! Wake up short bus! Lol

02 Camaro

iTrader: (5)

Well im buying a new ls2 block from tsp and i went to buy the rotating assembly and the smallest piston is a 4.005 bore so i got alittle confused... im probably going with a -3cc flat top piston but will a 4.005 bore piston fit in a std bore ls2?

bww3588

iTrader: (49)

No. Standard bore of a ls2 is 4.000. You will need to get a standard ls2 block, take the block and pistons to machine shop and have them fit the .005 over pistons to the bore.

02 Camaro

iTrader: (5)

Do they not sell a 402 rotating assembly with a std 4'' bore piston?

bww3588

iTrader: (49)

They do, but it's best to have the bore honed to the pistons for a perfect fit. If you try to buy standard pistons it's a crap shoot as to how well they will fit.

litle88

iTrader: (20)

Sorry my phone was acting up yesterday!

What that genius ^^^^ posted is the right way of doing it.

SOMbitch

iTrader: (8)

You need a target compression and then know your chamber cc size. My old TFS heads are at 60.5cc so I had to run a -11cc dish to get 11.3-1 on my 4.005" bore IIRC...

N2OBaby

If I remember correctly 4.002 is standard bore for LQ4/LQ9/LS2.

odarabla

iTrader: (1)

This
This
I have a built 402ci in my 2002 Z28.. We used a 4.005 piston and honed the block to fit the pistons.