Lq9 - Chevelle Tech
LSx Engine Discuss the LSx engine & associated components here.

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post #1 of 24 (permalink) Old Jun 18th, 19, 5:51 PM Thread Starter
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Brad
 
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Lq9

I'm looking at an Lq9(local private sale), but I would like to know if I can upgrade it with Ls3 heads and a cam?
The motor only has 25kmiles, maybe just install it like it is?
I've been looking for an Ls3 but they're pricey...
I would like to run it with a tremec 6sp. in my '69 elky.
The 350/350combo is getting tired...
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post #2 of 24 (permalink) Old Jun 18th, 19, 7:07 PM Thread Starter
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I've looked at Ls3
heads and from what I've read the cylinders must have at least a 4"bore, but I'm not sure what the bore is on a Lq9...
Any help or advice would be appreciated 🙂
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post #3 of 24 (permalink) Old Jun 18th, 19, 7:43 PM
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Cody
 
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Re: Lq9

https://help.summitracing.com/app/an...nd-lq9-engines
https://ls1tech.com/forums/generatio...questions.html

The bore on the LQ9 is 4.00, the head fitting will depend on the cam that you want to use.
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post #4 of 24 (permalink) Old Jun 18th, 19, 7:55 PM
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Re: Lq9

LQ9 is a nice engine. It has slightly higher compression, heavier duty rods and floating piston pins. Good engine for sure, I had a couple of them. LS3 will bolt up, you will different rocker arms for some of the valves. I would try it as-is with a cam and spring change. It may give you the performance you seek w/o buying heads.

*69 SS 502 EFI /224* HR/9.8:1/T56/3.90/ 4000lbs RW 11.5/124mph
*11 C6, 6.2, 6spd
*96 Stang 6.0 turbo 10.5/135mph
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post #5 of 24 (permalink) Old Jun 18th, 19, 8:46 PM Thread Starter
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Thank you for the information.
With only 25k miles for $2k complete with ecu, is this a good deal? Or should I keep looking?
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post #6 of 24 (permalink) Old Jun 18th, 19, 10:33 PM
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Re: Lq9

I'd jump on that price with those miles. Does it throw any codes or is it already a pulled out motor? what compression? What oil pressure cold and hot? These may all be unanswerable questions at this point but its worth asking.

Rick
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post #7 of 24 (permalink) Old Jun 19th, 19, 5:39 AM
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Vince
 
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Re: Lq9

Quote:
Originally Posted by B rad '69 elky View Post
Thank you for the information.
With only 25k miles for $2k complete with ecu, is this a good deal? Or should I keep looking?
Hard to say b/c prices vary significantly based on location. I usually pay around 1000-1100 for mine, complete but they have ALOT more miles - like 77-100k. I'd say 2000.00 is a good price for a complete LQ9 with that low of miles - IF you can indeed confirm the mileage.

Question I have for you though, do you plan on using the factory ecu? If you do, you will have to go to a tuner and have it tuned for everything which kind of sucks. If you get an aftermarket ECU, you have total control of the engine for about the price of a couple of tunes.

*69 SS 502 EFI /224* HR/9.8:1/T56/3.90/ 4000lbs RW 11.5/124mph
*11 C6, 6.2, 6spd
*96 Stang 6.0 turbo 10.5/135mph
*2011 Mustang GT premium
*61" Scag Kohler 22hp 7mph
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post #8 of 24 (permalink) Old Jun 19th, 19, 9:56 AM
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Re: Lq9

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Here's a link to my 2014 Camaro SS donor to 70 Malibu restomod project:

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post #9 of 24 (permalink) Old Jun 19th, 19, 12:44 PM
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Re: Lq9

My friend james got a stock LQ9 and stuck it into his mid 70's chevy long bed at 4000+ lbs race weight with the mid 70's 3 speed automatic and 3.45 rear gear spinning very heavy 235-75-15 mud and snow tires it ran 13.5 at the track. 2.1 60 foot.

Carbureted.
But some things were done to it.
RPM intake and we had a cam ground using the LT4 hot cam masters.
this cam.
https://www.summitracing.com/parts/nal-24502586.
But with 1.7 rockers you get more..It also has the bushing upgrade to the rockers. and to get geometry right a tick longer pushrod was used.. we used the factory cam out of his LQ9 and reground it and stuck it on a 109 LSA.
It will pull to 7000 rpm really quick.
313 rate beehive PAC springs were used 130 seat pressure.

In a lighter car with a better trans and some gear that thing would fly.
I am not impressed with the LS so much but this one runs very well.
I ported the stock heads on it also.
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post #10 of 24 (permalink) Old Jun 19th, 19, 1:18 PM
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Re: Lq9

does gmpp or pace still sell those cheap LS3 heads? Have them in CNC also

If it were me port the stock heads put a cam in it and call it done. Strong engines...think 2k for 25k mi is decent
a 150-200k (who knows really) Cl 5.3is still over a grand.

Do you know for sure its only 25k? which reluctor wheel # is it?

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post #11 of 24 (permalink) Old Jun 19th, 19, 2:10 PM
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Re: Lq9

Quote:
Originally Posted by jeff swisher View Post
My friend james got a stock LQ9 and stuck it into his mid 70's chevy long bed at 4000+ lbs race weight with the mid 70's 3 speed automatic and 3.45 rear gear spinning very heavy 235-75-15 mud and snow tires it ran 13.5 at the track. 2.1 60 foot.

Carbureted.
But some things were done to it.
RPM intake and we had a cam ground using the LT4 hot cam masters.
this cam.
https://www.summitracing.com/parts/nal-24502586.
But with 1.7 rockers you get more..It also has the bushing upgrade to the rockers. and to get geometry right a tick longer pushrod was used.. we used the factory cam out of his LQ9 and reground it and stuck it on a 109 LSA.
It will pull to 7000 rpm really quick.
313 rate beehive PAC springs were used 130 seat pressure.

In a lighter car with a better trans and some gear that thing would fly.
I am not impressed with the LS so much but this one runs very well.
I ported the stock heads on it also.
Sure You talking about the right engine? The cam you linked is not for an LS and the LSís already have 1.7 rockers.

*69 SS 502 EFI /224* HR/9.8:1/T56/3.90/ 4000lbs RW 11.5/124mph
*11 C6, 6.2, 6spd
*96 Stang 6.0 turbo 10.5/135mph
*2011 Mustang GT premium
*61" Scag Kohler 22hp 7mph
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post #12 of 24 (permalink) Old Jun 19th, 19, 3:59 PM
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Re: Lq9

The LQ9 was the higher performing truck engine. It's a nice engine and yes, LS3 heads will fit.

You'll need HPTuners to tune and make adjustments to that GM PCM.

A proper fuel system is really important. Your best choice is a Rick's Tanks Restomod tank that accepts a non-return GM fuel module and a PWM controller from VaporWorkx.

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post #13 of 24 (permalink) Old Jun 19th, 19, 6:33 PM
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Re: Lq9

Quote:
Originally Posted by 69-CHVL View Post
Sure You talking about the right engine? The cam you linked is not for an LS and the LSís already have 1.7 rockers.



We used the master for that LT4 cam on the LS cam.
so .492" lift is .328" lobe lift and then the LS 1.7 rockers make that grind .557" lift.
You get more duration at the same time just a couple numbers more.
I checked piston to valve clearance and had just over .100" intake and exhaust with the stock flat top LQ9 pistons.



Can even use those masters for a Ford Or Mopar or BBC cam.


Nice to be able to mix and match masters to get what you want.


Buddies truck is heavy and I wanted to keep the LSA tight closing the intake valve a bit sooner traps that much needed cylinder pressure. Get the pig out of the hole.


If he was lighter or had a bit more compression or better gear I may have opted to use the exhaust master on intake and exhaust lobe.. another 10 degrees @ .050 on the intake side i feel would do quite nice. But I was also worried about piston to valve clearance.
I knew the intake side would be the culprit tightening the LSA.



I had a single pattern ground off that LT4 For my old gen 1 357" in my 47 dodge. 228-288 @ .050 with .492" lift and had it ground on a 110LSA. Gentle little roller cam for every day driving you know.
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post #14 of 24 (permalink) Old Jun 19th, 19, 6:58 PM
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Re: Lq9

Putting LS3 heads on an LQ9 would be more trouble than its worth IMO.

I think you will be more than happy with a cammed LQ9. They come stock with 10:1 CR.

FWIW I have headers only LQ9 in my Chevelle. I got on it a few weeks ago and it broke the tires loose going about 20mph and almost sent me into a wall. This is with 4.10 posi rear.

Do not underestimate the LQ9.
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Mike Smith
72 Chevelle, LS 6.0 LQ9 4l80e
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post #15 of 24 (permalink) Old Jun 19th, 19, 7:04 PM
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Re: Lq9

Also the best source for information regarding LS swaps can be found here www.ls1tech.com

Everyone on that site has been there and done that. Its hit or miss here since many guys are still running the old engines.
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Mike Smith
72 Chevelle, LS 6.0 LQ9 4l80e
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