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Mystery 6.0L Core ???

 
Old 02-23-2019, 06:58 PM
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Default Mystery 6.0L Core ???

I recently picked up an engine core and I am confused as to what it is...

So far It is clear that the engine is a Gen IV 6.0L, build date November of 2007 and VIN that went into a 2008 vehicle.
It has DOD/ AFM lifters and valley cover with NO VVT.

What is ODD is that it had Cathedral port heads on this engine.
I stupidly did not look at the cylinder head casting number before taking the short block home.
If I remember correctly, the heads looked like the larger chamber 317 heads that were on Gen III LQ4 engines.
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Old 02-24-2019, 12:12 PM
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All Gen 4 6.0 have rectangle port heads...so if it is Gen 4 someone swapped the heads and the only Gen 4 6.0 with AFM was the Aluminum L76 from the NNBS Vortec Max Trucks...also on the back of the block it will tell you the displacement and if it’s a Gen 4...example of my L96...post some pics for us


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Old 02-24-2019, 12:17 PM
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Was the engine in a vehicle when you first saw it? I wonder if someone used a Gen IV 6.0 short block to rehab a Gen III engine in an older truck, and left all the DOD junk in there.
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Old 02-24-2019, 01:05 PM
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Is it a iron or aluminum block? What casting head #? What color crank sensor?
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Old 02-24-2019, 07:19 PM
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Originally Posted by 01FormulaTA View Post
All Gen 4 6.0 have rectangle port heads...so if it is Gen 4 someone swapped the heads and the only Gen 4 6.0 with AFM was the Aluminum L76 from the NNBS Vortec Max Trucks...also on the back of the block it will tell you the displacement and if itís a Gen 4...example of my L96...post some pics for us
The later LS2s were technically Gen 4 and had cathedrals.
The LFA and LZ1 were hybrid versions of the LS2. 243s with flat tops, VVT, AFM.
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Old 02-24-2019, 07:31 PM
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I'm starting to get information coming in...

I went back to the dealership that had the engine core.

The heads that I left behind are 243 castings.

I am waiting on a break down of the last 8 of the VIN... so far I know the engine came from a plant in Australia and the vehicle is a 2008 Pontiac or GMC of some type...
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Old 02-24-2019, 07:33 PM
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Is it POSSIBLE that in 2008 a Pontiac G8 could have had a L76 engine with DOD and 243 heads?

Or was the a 2008 GMC truck with the L76 vortec-max as stated above with 243 heads?

What confuses me, is I was under the impression L76 engine had VVT... The engine core had no VVT cam/ timing set/ timing cover/ actuator/ or electrical...

Last edited by vorteciroc; 02-24-2019 at 07:39 PM.
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Old 02-24-2019, 07:35 PM
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No, the L76 had rectangle ports.

Is the block you have iron with cathedrals? There were no Gen 4 iron/cathedral combos from the factory.
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Old 02-24-2019, 07:41 PM
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No... That would make too much sense.

It is aluminum...

Looking at the engine core, one would think it to be an LS2 however it has DOD... This is why I call it the MYSTERY engine core.
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Old 02-24-2019, 07:43 PM
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The LFA was available in 2008 models. Its an aluminum/cathedral engine with DoD.
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Old 02-24-2019, 07:53 PM
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Originally Posted by JoeNova View Post
The LFA was available in 2008 models. Its an aluminum/cathedral engine with DoD.
Now that is interesting! You are certain the LFA did not use VVT?

Should that be the case, you may be correct.
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Old 02-24-2019, 09:08 PM
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Do you have a picture of the engine?

The LFA had VVT.
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Old 02-24-2019, 10:07 PM
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I can a photo of the cylinder block... what exactly would you want to have a photo of?
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Old 02-24-2019, 10:12 PM
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Here is the only one I have at the moment...

Just let me know specifically what you are looking for.

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Old 02-24-2019, 10:24 PM
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As of today, it now looks like this...


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Old 02-25-2019, 08:31 AM
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Once it is stripped that bare, the RPO code becomes irrelevant. Once you strip an LM7 block down to nothing, it becomes the base that was used for 4 different RPO codes. Same for several other engines.
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Old 02-25-2019, 10:56 AM
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Measure the bore. Sounds like a 5.3.
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Old 02-25-2019, 12:12 PM
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Originally Posted by GarrettT/A View Post
Measure the bore. Sounds like a 5.3.
Seems a little excessive considering it will say either 5.3 or 6.0 directly on the block.
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Old 02-25-2019, 02:24 PM
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This is true ha.
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Old 02-25-2019, 11:15 PM
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Yeah, the block has two locations cast as "6.0L" and the bores measured 4.0004" to 4.0010" ...Obviously a 4" bore engine.

They are now approximately 4.005". I just ordered new JE forged flat top pistons with dual valve reliefs and a Total Seal ring set for this engine.

I also ordered a set of Manley 6.125" pro-series I beam connecting rods and a Callies DragonSlayer 4" crankshaft.

Are many of you guys running perfectly "square" engines?

I was concerned it was an odd-ball factory mistake or who knows what else... Maybe something Rare?

So far it is looking like a 6.0L from a GMC Yukon Hybrid.

I'm still waiting on more information...

Any recommendation on cylinder heads for this displacement engine? I have up to $3,000 to spend on heads less springs/ retainers/ locks and machine work.
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