Jorlain

iTrader: (4)

Hi folks. I'm hoping someone more familiar with the LS platform can help me with this.

I've got an 2005 LQ4 I'm putting together. The rods are the gen 4 style (beefy, floating wrist pin, etc). There are two style of bolts that seem to be common - the first design, which appears to be knurled and has 1 dot on the head, and a second design that has a shoulder and 2 dots on the head.

Mine of course has neither knurling or a shoulder, and it has 3 dots on the head.

I've found one thread on LS1Tech indicating that it's a variation of the second design, the site that is cited to validate it is dead. I also have people on Facebook claiming it's a first design rod bolt.

This shows the difference between the first and second design bolts: https://help.summitracing.com/app/an...n-rod-bolts%3F
It also indicates that these were used from 97-99 - but I have 2001 LM7 torn apart in the garage that definitely uses the first design bolt.

Can anyone shed any light on the subject?

Thank you!
Mike

obeymybird

iTrader: (4)

What did the gen 4 rods come out of? They sound more like gen 3 rods cause all gen 4s have the sleeve on the bolt to keep them in place.

Jorlain

iTrader: (4)

From what I understand, some 2004 and all 2005+ got the gen 4 rods. I don't think any gen 3 rods were free floated, and I don't think any gen 4 rods were press fit, so I'm fairly sure I've got the gen 4 rod.

There's a sleeve in the rod that stops the bolt from coming out, but the bolt itself isn't knurled or shouldered like what's in the literature I can find.

obeymybird

iTrader: (4)

Why are you wondering about the bolts for? Without pics they sound like gen4 rods

Jorlain

iTrader: (4)

I'm trying to find torque values - which all indicate there's two different designs, and that dictates what torque values to use.

vorteciroc

Its the final revision of the Bolt (very common in Gen-IV Engines).

15 Ft/ Lbs and 85-Degrees is the spec (SAE 30 non-synthetic).

Usually comes out to about 48 Ft/ Lbs when I have Digitally Monitored the Torque generated during the 85* Rotation.

Jorlain

iTrader: (4)

Thank you! I've seen lots of people give random torque values from 45 to 51 and none of them gave me warm fuzzies. I was leaning towards doing the 15/85 anyways, even though I couldn't find confirmation, as I couldn't imagine a Gen IV rod having the old torque values, but I was just coming up short when I tried verifying.

Thanks again!