bigfatls6

iTrader: (34)

I found this thread and was wondering if it was correct. I am planning wswapping in a 6.0 lq4 for my ls1.
https://ls1tech.com/forums/showthrea...=bolts+6.0+rod

jmm98LS1

iTrader: (28)

That is correct, the pre '02 6.0's had a thicker flange on the crankshaft. They will not work with a t56 or 4l60e. You can use any ls1/ls6 crank with a 24t reluctor wheel in that block though. You may be able to have a machine shop mill the rear flange to the correct thickness, but it may be more cost effective to just pick up another crank. The lq4 I picked up for my 370 build was an '01 and had the thicker crank......so I picked up a low mile ls6 crank for $150.

bigfatls6

iTrader: (34)

I guess I will have to find out what year it is now. It came with the 317 heads.

12secSS

iTrader: (30)

In 2001 (possibly late 2001) and up, the 6.0L (LQ4) had the same crank as the LS1. Take a (good) picture of it and posted to verify. 1999-2000 had a spacer on the flange to mate up to the 4L80 using a conventional SBC converter. In 2001 they introduced the LQ9 with aluminum 317, at which time the LQ4 also changed over to the 317. 1999-2000 LQ4 had iron heads.

bigfatls6

iTrader: (34)

My crank has the casting number 12552216 which should be the 2002 or newer right?

NemeSS

iTrader: (127)

if its the engine u got from me,
it will work with a 4l60e flexplate and converter.
the motor was a 02' model.
with the standard crank flange, the large flange crank is way thicker
at .400 .
it will work fine with your 4l60e

bigfatls6

iTrader: (34)

Yea Im just trying to figure out if I want to go ahead and add some forged pistons and rods or just change the oil pump and add good rod bolts now. I pulled the rod caps and checked the bearing they all looked good so all i should have to do is add good rod bolts and let it eat.