LS2 Forged Piston.
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 56
Likes: 2
From: Grand Rapids, MI
LS2 Forged Piston. Ill keep it simple .
I have a Bare block thats freshly cleaned,Hot tanked,Honed and Cam bearings. I want to throw in a forged piston before putting it back together. If I find a 4.000 inch piston,will I be fine with the fresh hone and no bore ? Im aware crank will need rebalancing.
I have a Bare block thats freshly cleaned,Hot tanked,Honed and Cam bearings. I want to throw in a forged piston before putting it back together. If I find a 4.000 inch piston,will I be fine with the fresh hone and no bore ? Im aware crank will need rebalancing.
11 Second Club
Joined: Jan 2003
Posts: 1,000
Likes: 134
By hone i assume you mean it was just lightly honed, and not oversize. I have an LS2 i assembled myself, it was a low mile short motor in very good condition before i pulled it apart, gave it a quick hand hone with a dingle ball hone and assembled it at 4.000" stock bore with new JE fsr pistons. Doesn't burn a drop of oil and runs very strong. I never touched the cam bearings in it, still factory, they were fairly mint.
I used a 24x crank from another late model ls1 that had gen4 rods in it from factory. The JE fsr pistons i believe were lighter than the factory pistons from that engine, i forget the weights now. I did not get it balanced. You will only need to balance if the combined weight of rods/pistons/pins etc is heavier than stock, otherwise if it's lighter, run it. Mine runs perfect all the way to 8000rpm
A few vids below. (steering wheel is on wrong side, i live overseas....)
https://www.bitchute.com/video/B442PXOuby7Q/
https://www.bitchute.com/video/KifIxIIZCKCA/
I used a 24x crank from another late model ls1 that had gen4 rods in it from factory. The JE fsr pistons i believe were lighter than the factory pistons from that engine, i forget the weights now. I did not get it balanced. You will only need to balance if the combined weight of rods/pistons/pins etc is heavier than stock, otherwise if it's lighter, run it. Mine runs perfect all the way to 8000rpm
A few vids below. (steering wheel is on wrong side, i live overseas....)
https://www.bitchute.com/video/B442PXOuby7Q/
https://www.bitchute.com/video/KifIxIIZCKCA/
Thread Starter
Staging Lane
Joined: Jan 2020
Posts: 56
Likes: 2
From: Grand Rapids, MI
You are all correct . It was a ball hone to clean the walls up for a fresh rebuild. As far as I know,it should be stock bore minus the very small amount from the ball hone. I was figuring if I could find a piston the same dimensions as stock,I should be fine without an overbore Im no expert tho .
11 Second Club
Joined: Jan 2003
Posts: 1,000
Likes: 134
You are all correct . It was a ball hone to clean the walls up for a fresh rebuild. As far as I know,it should be stock bore minus the very small amount from the ball hone. I was figuring if I could find a piston the same dimensions as stock,I should be fine without an overbore I’m no expert tho .
Last edited by Launch; Oct 24, 2023 at 09:29 PM.
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11 Second Club
Joined: Jan 2003
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Likes: 134
Mine are custom GM heads from 24hr daytona nascar. They're not a factory ls7 vette casting. They're basically an ls7 head but with smaller chambers and valves (2.10/1.55) to suit a 4.000" bore and smaller CI engines. And custom rocker setup. Intake ports are also smaller than an ls7 vette head at 235cc. I have no idea on the exhaust port volume, all i know is they looked huge.
You can still find these heads for sale but not the T&D rockers to suit them. By the time you get new T&D rockers made for them now it's probably not worth it.
I think there's some other aftermarket small bore ls7 heads available, i haven't looked. There's good small bore ls3 heads available now also that flow a heap
You can still find these heads for sale but not the T&D rockers to suit them. By the time you get new T&D rockers made for them now it's probably not worth it.
I think there's some other aftermarket small bore ls7 heads available, i haven't looked. There's good small bore ls3 heads available now also that flow a heap
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