racecar

I'm looking at buying a used GM LS crankshaft 3.622 stroke with a 24X timing wheel.
Are all the 3.622 stroke cranks the same? I don't know if I am getting an LS1 or an LS6, is there a difference in metals or design, or anything???

LS1Formulation

iTrader: (13)

I just bought an LS6 crank from Katech. It's functionally identical to an LS1 crank. What I don't know is if GM used a different casting for 5.3 or 6.0 truck engines due to the piston weight being different in those engines. Maybe someone with a little more knowledge can chime in here.

racecar

All LS1 or LS6 cranks should be the same? Maybe the truck engines have more counterweight.

blackLS1m6

iTrader: (14)

They are the same but the truck cranks had a wider rear seal surface.

got-a-ls1

iTrader: (12)

truck cranks are also not drilled like the ls1 cranks in the journals, if memory serves correctly... which means they are heavier, but not necessarily stronger.

1FastBrick

iTrader: (16)

Cranckshafts with the 12552216 casting number = Same crankshafts but machined differently for each application. All interchangeable just be sure to have it ballanced for your application.

https://ls1tech.com/forums/11028189-post4.html

https://ls1tech.com/forums/generatio...lq9-crank.html

racecar

Thanks Guys, good info. Now I know what to ask for, As long as it has the hole drilled through the journals, it's will work for me..

1FastBrick

iTrader: (16)

You mean the 1 inch hole gundrilled through the center of the mains... LOL Cranks usually have holes drilled through the journals for oiling

racecar

Yes, We do need oil holes. The crank grind shop said it has the holes, yes the big ones.
Thanks Everyone for the info.