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I finally own an LS engine

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Old 01-12-2018, 12:28 AM   #1
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I finally own an LS engine

Well actually it's an LQ4 out of a 2009 Chevy van. 6.0L iron block with rectangular port aluminum heads. I'll have to look at the repair order but I think it has around 175,000 km on it.

It was losing oil pressure at an idle. We diagnosed it as a bad oil pump but the customer supplied a junkyard replacement that was actually in worse condition than this one but that's what he wanted.

I bought the core for $200.

The truck intake manifold got broken but I plan on using a carb anyway. The front accessories are not complete but I don't think I want the truck style of the accessories anyway.

I'll do a partial strip down just to see what it looks like. Probably going to get at least cam change and ARP rod bolts. Not sure what I'll put it in. The BBC in my race car is more than enough engine to have fun with.
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Old 01-12-2018, 01:28 AM   #2
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Re: I finally own an LS engine

Sounds like you've got another fun project to think about.

I think LQ4 6.0L is a Gen III engine with cathedral port heads. According to Wiki, the last product year of LQ4 was 2008. If you have rectangle port heads, then perhaps it is an LY6 6.0L engine with variable valve timing? Excerpt from Wiki,

https://en.wikipedia.org/wiki/LS_bas...l-block_engine
The LY6 is a Generation IV small block V8 truck engine with a cast iron block. It shares the same bore and stroke as its LQ4 predecessor. Like other Gen IV engines, it features variable valve timing. It generated 361 horsepower at 5,600 rpm and 385 lb-ft of torque at 4,400 rpm using "regular" gas, or ~87 octane. Redline is 6,000 rpm and compression ratio is 9.6:1. This engine uses L92 / LS3 style rectangle port cylinder heads, though without the sodium filled exhaust valves of the LS3.

Applications:

2007–2009 Chevrolet Silverado HD
2007–2009 GMC Sierra HD
2007–2013 Chevrolet Suburban 3/4 ton
2007–2013 GMC Yukon XL 3/4 ton
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Old 01-12-2018, 05:32 AM   #3
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Re: I finally own an LS engine

He may have a LY2. I had to go to Chevy's website to see what they call their vans. It's called the Express, and the 2009 model comes with the only Gen IV engine that doesn't have VVT... which is good.


The Vortec 4800 LY2 (VIN code "C") is a Generation IV small block V8 truck engine. Like its LR4 predecessor, it gets its displacement from a 96.01 mm (3.780 in) bore and 83 mm (3.3 in) stroke. The smallest member of the Generation IV engine family, it is unique in that it is the only member of that family that is used in trucks that does not feature variable valve timing.It has a cast iron block. Power output is 260–295 hp (194–220 kW) and torque is 295–305 lb⋅ft (400–414 N⋅m).
LY2 applications:
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Old 01-12-2018, 09:14 AM   #4
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Re: I finally own an LS engine

Yup. It's a gen IV without VVT and was in a van. I don't have any block or head casting numbers yet.

It has IV and 6.0L cast in the back of the block.

The cam sensor is in the front cover.
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Old 01-12-2018, 09:51 AM   #5
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Re: I finally own an LS engine

You have an LY6. Great foundation. I would leave the rod bolts alone unless you are going to take it all apart, hone, balance and resize the rods. If it has good compression just address the oil system, add a cam and accompanying valve springs and enjoy a very stout motor.
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Old 01-12-2018, 09:58 AM   #6
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Re: I finally own an LS engine

Finally got a chance to look at the RO. It's from a 2008 Express G3500. It has 173353 km on it.
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Old 01-12-2018, 10:01 AM   #7
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Re: I finally own an LS engine

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Finally got a chance to look at the RO. It's from a 2008 Express G3500. It has 173353 km on it.

With 107k miles that is a good deal. Hopefully it had regular maintenance and was never starved for oil if the pump was going. Does it turn over freely?
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Old 01-12-2018, 11:27 AM   #8
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Re: I finally own an LS engine

I only have the first page of the RO showing me vehicle information. I didn't work on the vehicle. It was making noise.

Vehicle was running. All I was told that it wasn't making enough oil pressure at idle and it was diagnosed as needing an oil pump. When oil pressure was tested, there was pressure at the cooler but minimal at the top end.
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Old 01-12-2018, 12:20 PM   #9
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Re: I finally own an LS engine

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I only have the first page of the RO showing me vehicle information. I didn't work on the vehicle. It was making noise.

Vehicle was running. All I was told that it wasn't making enough oil pressure at idle and it was diagnosed as needing an oil pump. When oil pressure was tested, there was pressure at the cooler but minimal at the top end.

Knowing this I would at a minimum pull the heads and replace the lifters. LS7 lifters can be had for $100. It would also let you look at the cylinder walls to see if there is still a cross hatch present.
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Old 01-12-2018, 08:13 PM   #10
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Re: I finally own an LS engine

My LY6 I bought has in bad shape but the main root looked to come from a bad valve spring which led to a dropped valve lol you know how it goes from there.
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Old 01-16-2018, 05:41 PM   #11
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Re: I finally own an LS engine

I still haven't brought my engine stand to work but I did get a chance to look at the engine briefly today. Block casting is 12576181
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Old 01-16-2018, 07:28 PM   #12
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Re: I finally own an LS engine

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I still haven't brought my engine stand to work but I did get a chance to look at the engine briefly today. Block casting is 12576181

Yup, that's an LY6
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Old 01-18-2018, 03:19 PM   #13
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Re: I finally own an LS engine

I've done some researching and checking and yes, it is a LY6. The engine does have the extra plate and harness on the front of the timing cover for the VVT.

I don't plan on using a computer and EFI so I can probably build this engine without VVT.
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Old 01-18-2018, 04:43 PM   #14
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Re: I finally own an LS engine

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Not sure what I'll put it in..
That's my question to you.
Another 3rd gen? Maybe a nice pickup?
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Old 01-18-2018, 05:07 PM   #15
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Re: I finally own an LS engine

If I still owned the 1991 454 SS pickup truck, this would have been a perfect twin turbo engine candidate. Truck had a Gen V 454 (boat anchor), 4L80E transmission and a 14 bolt diff.

I don't know. Maybe a street legal third gen. I saw someone locally has a 1964 2 door Impala for $9000.

Other options are FWD cars such as Cobalt etc. There are a lot of options and conversion for these type of cars. Local racer has a late 80's FWD Buick racing in Super Stock. Back half kit, SBC under the hood and it runs high 9's. Interior still looks factory except for all the carpet covering the back half.
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Old 01-18-2018, 07:20 PM   #16
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Re: I finally own an LS engine

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Originally Posted by AlkyIROC View Post
Maybe a street legal third gen.
A few of those I've seen locally too (I'm shopping for a parts car at the moment). The swap is simple enough now.

Quote:
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I saw someone locally has a 1964 2 door Impala for $9000.
That would be sweet.

Last edited by skinny z; 01-18-2018 at 07:24 PM.
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Old 01-18-2018, 09:47 PM   #17
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Re: I finally own an LS engine

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A few of those I've seen locally too (I'm shopping for a parts car at the moment). The swap is simple enough now.
It's hard to find a good deal on a third gen. A rusted out car is inexpensive. Something in good condition would cost more than that Impala.
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Old 01-18-2018, 10:07 PM   #18
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Re: I finally own an LS engine

I've kept my ceiling at $1000 but then again I'm looking for something specific and not a project.
It's interesting that the price of the 3rd gen has steadily kept climbing. The place to go would be stateside though. I picked up my rust free (or very very nearly so) 86 Coupe roller with a blown up V6 for $600 US. The folks in Virginia didn't care much for the f-body. Cost me about that to trailer it home (to Ontario) but I've had it for about 10 years now and the paint is still holding up. (Just don't get too close.)

Back to topic regarding your LS. I too have one here should I decide to scrap my 06 Tahoe rather than try and repair it. But then I'd have a worn out 5.3 and still have to rebuild it, add some speed parts and THEN buy all of the swap stuff to make it go. It gets expensive in a hurry. Or I can get a fresh 383 shortblock (I've contacted Charlie at AMS engines), reuse my heads and call it a day.
Interestingly, I'm still on the fence about the whole thing.
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Old 01-18-2018, 11:51 PM   #19
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Re: I finally own an LS engine

Been doing a lot of reading. The VVT can be easily deleted by using a non VVT camshaft and every LS engine can benefit from a cam swap. Front cover would also need to be replaced.

Since this was swapped out as a replacement, there's a lot of things missing such as all the accessories, mounts etc. I can see myself heading to the local pick-a-part to piece together all the little stuff that's missing since just about everything in the LS series is interchangeable.

This LY6 was rated at 364HP from the factory. A good cam swap can easily push this into to the 450-500 HP range. I might wind up over carbing the engine since the only gasoline carb I have in my garage is an old 850 DP BG Speed Demon with very little track time on it.
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