What engine do I have?
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Teching In
Joined: Jun 2024
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What engine do I have? Im brand new to the LS scene. I just purchased a 2006 Envoy Denali for pretty cheap, but im unsure of what engine it has. I plan to rebuild it because it has an inconsistent miss and the slightest amount of non-magnetic metal in the oil. After removing the intake, i can see that it doesn't have a DOD valley cover. It has a gen 4 valley cover with no knock sensors or plug in the back. Im assuming the LH6 was swapped out of this vehicle with another gen 4 engine. The only codes i found were for the oil pressure sensor and for the missfire. It runs, drives and shifts perfectly, aside from the miss, with 168k on the dash. What engine could this be?
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
It could still be an LH6 that's been converted to non-AFM/DOD. It's not that involved, though head removal is needed to switch out the lifters and trays. It might still have the original cam.
Any way of getting any casting numbers? It might not be a 5.3, though it most likely still is.
Any way of getting any casting numbers? It might not be a 5.3, though it most likely still is.
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
That block # does apply to the LH6, but it also was used on all the other Gen IV 5.3 aluminum blocks, the main differences of which were whether or not they had AFM/DOD and/or VVT., and one of 2 different cams. Otherwise, all aluminum Gen IV 5.3's are the same
You likely have an LH6 on which AFM/DOD was deleted. The LH6 didn't have VVT so you don't have that.
I hope this helped!
You likely have an LH6 on which AFM/DOD was deleted. The LH6 didn't have VVT so you don't have that.
I hope this helped!
Thread Starter
Teching In
Joined: Jun 2024
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From the looks of the rod, and the remaining metal in there, someone did a quick patch and go to it. I’d 100% tear it down and go through it all…but I’m **** about everything and want it all correct, not just “close enough”.
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Joined: Apr 2006
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From: Grand Rapids, Michigan
When I tore my LH6 down with roughly the same mileage, it was toast. Had .002 taper in the bores, a lot of scoring, and numerous bearings had copper showing. Not only that, but it had the oil bypass issue with the oil pan and wouldn't hold oil pressure at idle. I wasn't planning on using it stock anyway, but it was not in good shape. LS engines that aren't DOD may last 300K, but I highly doubt there are many that came equipped with DOD ( even if it got deleted ) that have made it past 200K. I would tear it completely down and at least clean the block and re-ring it with new bearings.
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