Stampede4ever

As the title says, I picked up a 6.0L with issues, I can't tell if it's a gen III or gen IV.

Thanks.

REDBEARD5269

gen III's have the knock sensors located in the lifter valley, Gen IV have the knock sensors on the side of the block.

Stampede4ever

Learned something new today, it's a gen III.

Thanks.

Lsxford

iTrader: (6)

It may still have the thicker rods and floating pistons. Usually if the lifter valley and manifold bolts have 13mm heads you have the gen4 rods and pistons. 10mm bolts its all gen3

REDBEARD5269

Didn't know that. Is there a stamp on the rods or any other identifier as far as gen IV internals? I have a 6.0 genIII short block with heads but nothing else so I don't have the bolts. I'm doing a stroker build so I don't need the stock internals but asking more out of curiosity.

JoeNova

Look up gen 3 vs gen 4 rods on google. The rod sized is significantly different.

JimsNovaLS

Gen 4 pistons will have retainers holding the pins in place.
Gen 3 pins are press fit in the rods, no retainers needed.

Lsxford

iTrader: (6)

They also have a extruding dimple on 1 side of the rod. Between the dimple, how big they are and the piston pins youll know

20psiofevil

I bought an 04 Silverado and trying to figure the same. If it has the gen iv rods and pistons. Can someone confirm if any 04's come with gen4 hardware?

Lsxford

iTrader: (6)

My 04 LQ4 has gen4 rods. If you have 13mm headed exhaust manifold and lifter valley cover bolts you have the better rods more than likely. If theyre 10mm its gen3.

20psiofevil

They have the 13mm heads for sure. Is there a difference in the piston tops? Is there a way to run my bore scope down a plug hole to tell for sure?

Stampede4ever

Is it like a tear drop on the inside, about half way down the rod?

Thanks.

JoeNova

Looking for a dimple?

The rods are very obviously different. You shouldn't even make it to the dimple before you know.

G Atsma

Wow. After seeing the diff between them, no contest. Gen 4 looks the clear winner in the rod dept. YUUGE difference.....

Stampede4ever

This is my first LS, I will have to look again, but I think I have the 4th gen rods.

Thanks.

Stampede4ever

Yep, it has gen 4 rods.

Thanks.

Stampede4ever

It also has the 13mm valley cover bolts, it didn't have the manifolds on it when I picked it up.

Thanks again.

20psiofevil

How about the piston tops? Are they the same? Not going far enough to drop the pan at this time.

JoeNova

You won't be able to tell looking at the tops of the pistons.