streetknight2

iTrader: (10)

I know one's dished and one's not. But are they both pressed fit rods? I know the LQ4 is, but is the LQ9?

Thinking of putting LQ9 pistons in my LQ4 to get the compression up, but don't know if they'll go on my rods.

TIA

KCS

iTrader: (20)

Any piston can go on a press fit rod, but a piston needs to have a groove machined in the pin boss to be used with a floating pin.

If your rods are for a press fit pin, it won't matter either way and you would be okay.

John Theroux

Doing the exact same upgrade to my truck... Just picked up some DNJ P1369's (LQ9 pistons) to go in my 2000 LQ4. Also doing rod bearings, rings, water pump, head gaskets, belt tensioner, belts, exhaust manifolds, etc.

dodson55

iTrader: (18)

depends on the year late 04 up is floating early 04 down is pressed

Joe69z28

So its safe to say 05 and later LQ4 have floating pin and the better rods. Did all LQ9s even the early years ?

dodson55

iTrader: (18)

yes all 05 up have floating rods im not sure if all lq9 had floating or not i believe they changed the same time the lq4 did but dont hold me to that

chrisfrost

iTrader: (8)

I know for sure that the press fit pins and the full floating pins are a little bit different size pin diameter ,,,,it's only something like .025" difference but enough that You can't use the earlier pistons with the newer rods and vise-versa . Go to summit and look up pistons for 2003 and 2007 and they'll have the pin diameters listed along with comp height ........,etc They changed I believe all LS based gen3's and gen 4's to the newer full floating pin rods in mid 2004 .

Joe69z28

Thanks, this is very good info , been trying to verify this for sometime now. Do early LQ9 rods have any casting #s or mark to identify them ,I believe they were floating pin too.

ebnermadison

Hey John Theroux, I'm looking to do this same swap. How did your's go? any recommendations or learning you could share?
My Rods will be press fits. Just want to see if there is anything you would do in in hindsight?