Rob07002

Has 317 heads and this on the block

bigdaddy350

I think the 317 heads were only used on LQ4 and LQ9 motors. Some where on the front or back there should be "6.0L" cast in to it.

Rob07002

Thank you. To be more specific, I'm trying to find out the year. Good rods and floating wristpins vs pressed pins, etc. Also, where would I find the entire VIN. Dealing with a shady junkyard and want to verify mileage and donor vehicle.

bigdaddy350

I don't think they ever stamped the VIN into the motor. Is it DBW or DBC? 317 heads means it's no older than 2000. 1999 was the last year for the iron headed LQ4 (that is what i have)

bigdaddy350

This has good info
https://ls1tech.com/forums/conversio...ification.html

1FastBrick

iTrader: (16)

Look on the pass side front deck just behind water pump.

The date code is in cast there.

Pull a spark plug and try to examine one of the pistons at TDC. It's likely an LQ4 as the LQ9 fetches a premium.

Rob07002

Thanks all. looking into it now. Do the numbers in the photo mean anything?

1FastBrick

iTrader: (16)

Not that I know of. Could be production or plant information but nothing relative to Id'ing the engine.

Rob07002

C253
Then a large 8 underneath
0309120964922319 - etched on top side on head, drivers side front
3091T5722363 - etched on top side on head driver rear

1FastBrick

iTrader: (16)

C253 is the date code.
C=March
25=day
3=2003 for the year

Rob07002

You rock!

Would this have the stronger rods and floating wrist pins?
Do the other numbers etched on the head mean anything?

1FastBrick

iTrader: (16)

No on the stronger rods.

The the numbers don't corespond to anything that I have found.

Rob07002

Many Thanks! I owe you a beer

So an 03 LQ4 317 heads and unknown mileage worth?? They're asking $1200 for it.

JoeNova

If it comes with absolutely everything, $1200 is in the ballpark of what they normally go for.

Unless you plan on adding lots of boost, the floating pin rods aren't necessary.

Rob07002

At what point is lots of boost? Isn't it relative? Meaning, if my HP/ET goals are met with only 16#'s, that's relatively moderate boost. FWIW, I don't plan on running more than 22#'s and really shouldn't have to on a 6.0 with twin S366's, custom cam, etc.

BTW, I decided to go with another 6.0. This one was too sketchy, dirty, mileage unknown, and looked like it was pulled out by a monkey.