Trying to decide on what engine....

[Alan66ss]

I have been thinking about the different possibilities. I have thought about an LS7, an LS6 or LS1 with the Kinsler stacked induction system. Or any choice of the three with the throttle body setup - like on II Much. I want something different that will give the feel of an old school engine but with the new LS technology. I have been talking to the accountant and she asks mostly about costs. Can you guys give me ideas on the costs of these different setups? Or maybe suggest something I have not thought about. I am looking to be in the 450 RWHP range with a good lope to the exhaust note.

Thanks for the input.

Alan

[WS6]

the cheapest way to reach 450 rwhp is a heads/cam LS1. You'll get a nice lope as well since the cam choice to reach 450rwhp will be somewhat radical. 230+ duration on both lobes. the old school feel is so much a part of the LS technology, that i think it'll be hard to get that feel. Then again, I think putting a carb on a gen3 is a little backwards.

if you want the old school feel with modern conveniences, you could always build an EFI gen1/2 engine. It'll cost more to reach your power goals, but it can be done all the same. It would have more of the muscle car sound and lope that I am sure you're used to.

[Madspeed]

All of your answers are at WWW.LS1tech.com (http://www.LS1tech.com)

Go spend a good month over there then you will have a very informed descision.

If you allready had an LSX in your ride then you would be able to just buy a Killer longblock and make Insane power

Or you can do like I do 1 piece at a time.

[BlackGMC]

You could but a Carb manifold on the LSX and use an edlebrock or Fast 4 barrel throttle body. The only downside it that you can't run a MAF (have to get a Speed Density Tune) and you have to move the IAT into the base of the throttle body.

http://www.edelbrock.com/automotive_new/mc/efi/tb_universal.shtml


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[Alan66ss]

Thanks for responding. I am looking into all ideas. I am just trying to be a little different.

Alan

[WS6]

grab up a 6.0 truck motor. LQ4 or 9 doesn't matter. put a 4.00 strocker crank in it and make it a 6.6 liter. Then you can have Allan's 6.6 66 ss. It's what I may do to my 6.6 liter TA, but you'll get yours done way before I do that's for sure. Or if you have the funds, dot he same thing to an LS2. Stroked 6.0s make a hell of a lot of power

[WS6]

here's an idea for you Allan. It compounded on what I said above. Start with a 6.0 truck motor or long block since it's usually cheap compared to an LS2. Put a 4.0 stroker crank in there with the stock rods and pistons. Top the block off with the new L92 heads and intake. Those heads will easily feed the stroker and they are cheap including the price of the intake. You can easily run something like a 236/240 cam in there. You'll have something different and it should make very good power. To Top it all off, it won't be that expensive. Double check my specs as you may even want to go bigger on the cam, but I think this would make for a good foundation to an interesting combo, that performs.

[Alan66ss]

Thanks Trey - that was the kind of info I was looking for. I was thinking about the 402 LS2 last night. It is very reasonable in price for a good short block. I will have to read up on the L92 heads though. Another reason to spend more time on Ls1tech.

I meant to ask you - and you must know this answer to get in to Tech - What is the good word?

here is a hint: THWG

Alan

[WS6]

haha I can't bring myself to say that phrase. I like it here too much. Now if Tech was over here in the hills like UGA, I would be so unbelievably happy. As is it now, I see living in ATL and going to Tech as some sort of exile. Maybe I'll change my mind once I have lived in ATL for a while, but I am not a big city person. I like my country sides.

[jsconiers]

Go with a 6.0 liter block. it will be very easy to get the power you want. For the price your going to spend on the ls2 block you can grab a complete used 6.0 engine with accessories. Then go with drop in 4.00 stroker crank and add a pro-charger. With the extra cubes provided by the stroker crank you could get well over 800 HP. With out the crank you could get 700HP. Cheap and proven!

[Alan66ss]

haha I can't bring myself to say that phrase. I like it here too much. Now if Tech was over here in the hills like UGA, I would be so unbelievably happy. As is it now, I see living in ATL and going to Tech as some sort of exile. Maybe I'll change my mind once I have lived in ATL for a while, but I am not a big city person. I like my country sides.

I know what you mean about that area. I have visited for work that I was doing at the time. The scenery was always very nice. If I could I would be out of Atlanta. Just have not found anything yet. It is to crowded here for me also. I grew up in Warner Robins surrounded by about 80 acres of farm land.

Alan

[Goatman]

Stock 6L are making 450hp at the rear wheels with a LS6 intake and a cam (fairly agressive one).

I agree with all those who say start with the 6L motor. I did!

[C5stein]

Stock 6L are making 450hp at the rear wheels with a LS6 intake and a cam (fairly agressive one).

I agree with all those who say start with the 6L motor. I did!

What heads are they using with the Truck motor to get those numbers?

Mark

[joeljet]

you can use the stock heads. the ports are the same as the ls6. only the comb chamber is a little bigger.

[Goatman]

Supposedly, stock heads (LQ9 compression) with a valve job, a LS6 intake, and a cam will get you there. Its a fairly rowdy cam.

[C5stein]

I figured that I would need to go to LS1, LS2, LS6 or L92 Cylinder Heads to get the compression up a bit and a cam in the range of 224 int./230 exh. @ 0.050 with 0.581 int./0.588 exh. lift, LSA 112 to get 450+ hp. Am I just making the engine issue too complicated?

Heck If I can get 500 HP at the flywheel from a ported set of truck heads, LS6 intake manifold big cam and some long tube headers, I don't see a big reason to spend another $1400 for heads and a different intake manifold. My C5 had 460 rwhp and it was fast enough for a street car.

Does anyone know what the truck 6.0 (LQ4)has for a compression ratio?

Thanks,
Mark

PS. the Exhaust ports on the LQ4 look alot smaller than LS6 heads, but I'm going from memory and that is a dangerious thing to rely on.

[C5stein]

Hey look what I found in Car Craft:
they got a junk yard LQ4 put a gm hot cam(219/228 .525 112) in it and a 750 carb with headers and got 483hp@6000/450tq@5000 at the Flywheel.

Even better they swaped on some L92 heads, 850 carb, 228/230 .571/.573 112lsa XR cam and hit 550hp@6800/464tq@5400.

So my guess is that, wanting to stick to FI not a dumb ol' Carb that if I got the correct L76 intake and L92 heads, left the bottom end of the LQ4 stock and swapped in a 228/230 - .571/573 - 112 LSA cam and 90mm TB and MAF that 550 hp is totally attainable.

I also saw another article last night where they took a Stock LS2 Short block, put the L92s and L76, 90mm TB, 39# injectors, valve springs for the added lift, Kooks Long tubes, and a 232/236 @ .050, .600 lift on a 112 cam and made 546 HP @ 6500 and 494.9#' of torque at 5000rpm.

That is definately LS7 power at a fraction of the price ($13,000 vs. less than $5,000). The only penalty is that the iron block weighs about 65# more than the Aluminum block. No big deal seeing that it is still lighter than the iron block Pontiac that I'm replacing and scooting it back a bit from the stock location.

[BlackGMC]

Like many others I would say start with a 6.0 block. I would bore it out .030 to make a 370. L92 heads and a Vic Jr. intake, with a 230ish cam. Simple, cheap and very effective.