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