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Discussion Starter #1
I'm making this thread to ask questions as i do my LS swap. I have my new engine. LQ9 block out of a 2004 SS Silverado, 55k miles, stock bottom end, 0821 heads, comp cam 273 LSR cam, Ls3 intake, 90mm TB. It was in his truck and i got to hear it and go for a ride….so i know the combo works…there has been questions on the PTV clearance on this set up. He did the build and never did a PTV check, and has 1k miles on this set up with no problems.I now the water pumps need to be changed and was thinking maybe electric?? I'm waiting for Holley to finish their 1st gen LS swap kit (Brent made me aware of the upcoming kit) before i change out the oil pan.



 

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1st question:
It looks like the head bolts were reused from his original engine and look to be stock. Do i change them out with ARP bolts while the engine is out or leave them as is as there are no leaks or problems?
 

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Don, I'd call the seller and ask if he reused the head bolts or used new stock ones. Those are supposed to be one time use only.

***Edit***

It looks like your head bolts are black. I know mine were original, and I seem to recall them being silver in color.
 

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Agreed on the head bolts. They are TTY and dont get re-used. I did not look up the specs on the cam, but if there was a PTV clearance problem, i'm sure it would have shown itself the first time the motor was run. No need for electric water pump unless you just want it. Have fun with the swap. Post pics
 

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^Good idea

OK…just messaged the person i bought the motor from.

he's reply…they are ARP bolts…so i know i'm good to go since they can be reused even if they were on his other build:hurray:
 

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It is possible to have a condition where you have some clearance and an engine will be fine in normal driving but in an extreme rpm situation (and/or valve float) you have contact. You can probably get some good feedback on your combination from an LS forum. Valve clearance with detailed information is a common topic.
 

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Nice buy. It would be nice if it were EFI'd on the install...maybe EFI is included in the kit?
 

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Here's the part number for the L99 water pump. This is off the newer Camaro's, but it uses the same accessory spacing as the 6.0/5.3 trucks:#19207665

Here's a comparison of the LQ9 vs the L99 Pump. The L99 pump will put the radiator hose on the driver's side so you can reuse your existing radiator.





You'll also need a new tensioner: AC Delco part #12628025

Here's the thread on LS1tech.com with a bunch of info: http://ls1tech.com/forums/generation-iii-external-engine/1632582-lq9-vs-l99-water-pump-pics.html

This pump looks the same as the LS3 pump, but the LS3 pump puts the accessories closer to the engine. The LS3 is a manual camaro, the L99 is the automatic.
 

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Discussion Starter #11
My head engineer (Brent) has a place to buy a new PCM tuned for my car set up. I also have to buy a new harness, i'm going to try and do the TBW route? I got an Xlink with the engine buy.
LOL…i think i'll just give my CC to Brent since he's done all the research and knows were to buy everything. I'll be using his build thread for a lot of my build.
 

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Discussion Starter #12
Actually thought of that. I'm trying not to remove the heads as they worked fine on his truck about a 1000 miles. When i went for a ride with him he had no problem getting on it and did take it to the drags for several 1/4 mile runs. I have been on LS1tech and found some people have had problems and some not. There is a build over on the truck side that this engine was used for the build.

It is possible to have a condition where you have some clearance and an engine will be fine in normal driving but in an extreme rpm situation (and/or valve float) you have contact. You can probably get some good feedback on your combination from an LS forum. Valve clearance with detailed information is a common topic.
 

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Discussion Starter #13
Nice buy. It would be nice if it were EFI'd on the install...maybe EFI is included in the kit?
He was supposed to get everything with the intake (fuel rails, injectors, etc)
If you look at the second picture you can see the fuel rail sitting on the LS3 intake. I have the 43#lb injectors, but did not get the coil packs with the buy, which i thought i was?
 

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That cam is a 223/231, so it's not a huge cam. You can post it over on LS1tech and see what they have to say about it. I think if it were going to have PTV issues, the previous owner would have found out on the 1/4 mile. I guess the only worry would be if you miss a shift and redline it hard. But to be 100% sure, you would have to pull the heads and clay the pistons.

You could try calling/PM'ing Martin from Tick Performance. He's a cam guru, and knows what will fit and what might have issues.
 

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If you look at the second picture you can see the fuel rail sitting on the LS3 intake. I have the 43#lb injectors, but did not get the coil packs with the buy, which i thought i was?
Another $100+.
 

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Just to keep all the info in the same thread, here are the hoses I used with the L99 water pump:

Upper: Gates 22373 (this is a lower hose for something like a Buick LaCrosse, but it's a great fit)
Lower: Dayco 71244 (this a lower hose for some kind of 85-95 Chevy/GMC truck)
U-Shaped return for heater delete: Gates 18743 (this has a 5/8" end and a 3/4" end, it just needs to be cut to length)
 

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I knew it wouldn't be cheap!

Did you get your L99 water Pump from rock auto?
Yes, it was around $150 for the pump. Don't forget the tensioner. I may have a set of LQ9 coil packs, brackets and wiring harness still. I bought an extra set and can't remember if I sold them or not. If I do, I'll pm you the details.
 

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Discussion Starter #19
Yes, it was around $150 for the pump. Don't forget the tensioner. I may have a set of LQ9 coil packs, brackets and wiring harness still. I bought an extra set and can't remember if I sold them or not. If I do, I'll pm you the details.

OK....look at the second picture 1st post, the truck water pump has a tensioner on it...is that the right one? Or is that the idler arm??
 

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OK....look at the second picture 1st post, the truck water pump has a tensioner on it...is that the right one? Or is that the idler arm??
That's the correct tensioner for the water pump that you're giving back to the seller. You can't use that with the L99 water pump. If you look back at my post with the pictures in it, I included the new tensioner part number.

L99 tensioner on left, LQ9 on right:


 
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