Fatspec2

I have an offroad rig with a swapped ls based engine in it that I am trying to get running right. The owner of it says the engine is an ly9 engine. Bought as a crate engine. I have hunted around and searched a bunch but have pretty well struck out on any real info on the engine. Does anyone have any info on an ly9 engine?

Is there a guide for engine ID that i might be able to use? As it was born from a crate i have no make model info to go on.

Thanx alot.

turbotuner20v

lq9 or ly6 maybe?

-TheBandit-

iTrader: (1)

Does the outside of the block have "Gen IV 6.0" embossed in the casting in front of cylinder #1?

fastspec2

I don't see that, at least on the side of the block. I am not able to see the face of the block due to the accesories. It does have a sensor in the front cover with 3 wires. white red and black.

-TheBandit-

iTrader: (1)

Can you snap a photo?

Sorry it would be "IV 6.0" and it's cast into the front of the block just under the driver's side cylinder head. You would have to move the accessories to see. Most likely if it has that cast in it is either an LY6 or an L96.

fastspec2

Slid a borescope down passed the ps pump. I see a "IV" cast into it, but the only numbers do not look like 6.0. Maybe a 8 and a 3 but they not in line, look more random of front of engine.

fastspec2

I can get more pics if it helps.

-TheBandit-

iTrader: (1)

Well the knock sensor is on the side of the block which indicates a Gen IV block, but your timing cover has no VVT actuator. Was the cam swapped?

The absence of "6.0" makes me think you may have a 4.8 or 5.3 on your hands, but I think those actually have "4.8/5.3" on the front of the block. I would pull off the accessories and look.

fastspec2

No swap, as is out of GM crate (at least thats what I'm told) but concidering the shape of the engine and no indication of it ever beeing cracked open I believe it.

So at least i know its no vvt now.

Thanx.

Sales4@Texas-Speed

iTrader: (4)

What is the casting number on the heads? I know this is not an end all be all for identifying the motor but it would definitely point us in the right direction.

fastspec2

243 cylinder heads.

Took a few more pics as well

Sales4@Texas-Speed

iTrader: (4)

I am leaning towards you having a 5.3l motor there. There were not very many iron blocks that came with 243 heads stock aside from the gen IV 5.3l iron blocks. Now this is all assuming the motor was not modified.

Che70velle

iTrader: (6)

I'm gonna say 4.8. A good friend just bought a new silverado crew cab 4wd, with a 4.8. It's got 243 heads, and an iron block.

bigwillys58

if it doesnt have dod/afm or vvt then its probably a 4.8 LY2.