jmm98LS1

iTrader: (28)

I need to know if there's a way to visually identify a lq4/lq9 6.0 liter crankshaft or block. I'm about to buy a 6.0 shortblock and the seller doesn't know what year it's from. I need a 01+ for what I'm wanting to do, so I'd like to verify I'm not buying an older block that I can't use. Thanks!!

Soul TKR

iTrader: (4)

not sure about the block but the pistons on an LQ4 are dished... I'll try and search from some sort identifying marks...

Soul TKR

iTrader: (4)

check out this thread... it may help

https://ls1tech.com/forums/showthrea...light=lq4+info

jmm98LS1

iTrader: (28)

Thanks, doesn't look like the answer I need is in there though.

Just buying the block/crank, there's no rods/pistons to reference. Are there casting numbers on the block or crank that will tell what they are????

jmm98LS1

iTrader: (28)

I think I found what I needed.......in case someone else needs the info:

6.0 crankshaft casting number 12552215 = '99-'00 LONG crankshaft (non-ls1 compatible)

6.0 crankshaft casting number 12552216 = '01+ SHORT crankshaft (ls1 compatible)

Hi Volume

iTrader: (3)

sorry to bring it back from the graveyard, but where can the casting numbers be located on the cranks>? I found a Lq4 shortblock for sale, but the seller doesnt know the year make or model it came from and i want to make sure its NOT the older iron headed 6.0

jmm98LS1

iTrader: (28)

It's cast into the bottom of one of the crank throws, I can't remember which one. You'd have to pull the pan to find it. Easiest way to identify it otherwise is look at the rear main seal. If the crank sticks out about 1/2" further than the seal, it's the thicker rear flange. The thinner rear flange will be pretty close to flush with the rear seal.

89 formula350

iTrader: (8)

here is a link from another site

Grunkybouy

Does anyone know what the journal sizes are on a 6.0 crank and or the 5.3 crank are? Are the cranks interchangable?

Quick Ranger

iTrader: (2)

The cranks are interchangable. The only thing, if you use a 5.3 crank in a 6.0 block, when you balance the assembly, chances are the crank will need weight added to it, since the pistons are heavier than 5.3 pistons. Adding weight will cost more at the machine shop.