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LQ4 vs LS6 Intake

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Old 01-20-2006, 03:02 AM   #1
5.0_CJ
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Default LQ4 vs LS6 Intake

Yes, the 6.0L truck intake in all its ugly *** glory actually makes more power than the LS6 intake, and more torque across the entire power band.

Just a little FYI, for all those interested in doing Intake Swaps on there LS1's and LS6's. If you look at the new Chevy High Performance Magazine, it will show you that the 6.0L Truck Intakes make more Horse Power and Torque then the LS6 Intakes. It also makes more Horse Power then the F.A.S.T. intake, but it does make like 7 Less Ft. Lbs. This was tested on the Stock Cams they said, so next month they will do a test on cam swaps, and the month after that they will do a test with heads too. But it looks like if you want to pick up a quick 8 Horse Power, and 3 Ft. Lbs. switch to a 6.0L Truck Intake.

LS1 = 419.7HP@4700 / 416.0TQ@5800

LS6 = 425.5HP@4700 / 421.0TQ@5700

6.0L Truck = 427.9HP@4700 / 419.0TQ@5900

F.A.S.T. LSX = 426.2HP@4800 / 427TQ@5900

Wieand/Lingenfelter = 411.2HP@4800 / 408.6TQ@6000

These were all done on a 346 cu. in LS1. This was a Mildly modified 1998 LS1 Crate Motor P/N 25534322. The article reads and I quote "What had allready been done to this engine is inconsequential for this test session. OUr concern was, as yours should be, about the numbers each manifold generated in a controlled environment."

Hope this helps you all. I would point out that even though slightly, the 6.0L Intake has higher numbers across the whole Torque band, and the and in the graph it shows it higher then the F.A.S.T. Actually I think that there guide to the graph is backwards(LOL) So it actually shows the 6.0L has higher HP all across the board not just peak, and that it is even with the LSX until 5300 for TQ.

With all the hype I hear about the LSX it was interesting to see dyno numbers, especially for a stock intake. In defense of the Lingenfelter, it is an aluminum intake, and not the nylon composite. There bottom plate is removable for lots of porting though but it does require conventional gaskets. Something to think about..........................

They also say that the going price of the 6.0L intake from a wrecking yard is about $100, so it is about 1/4 a LS6 (roughly $390) and 1/8 the F.A.S.T. (roughly $780). So I would much rather go with a 6.0L Intake, and then spend $700 on some other go fast goodies.


So, does anyone have any experience with this intake..? I'm just having some issues with how terribly ugly they are.
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Old 01-20-2006, 03:13 AM   #2
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Very interesting. Keep us posted on the post cam and heads results.

Mark
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Old 01-20-2006, 06:02 AM   #3
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Hmmm, very interesting. But will it fit under a stock hood?

Shane
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Old 01-20-2006, 12:34 PM   #4
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Quote:
Originally Posted by Shane_S
Hmmm, very interesting. But will it fit under a stock hood?

Shane

That's a very good question!
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Old 01-20-2006, 11:12 PM   #5
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No, it wont fit under a stock hood. It's huge, and you have to use all the other truck parts, like the fuel rails and the other BS that sits on top. I actually have one laying around and its a beast. I'll take some pics for you. Oh, and by the way... forget using fuel rail covers with this baby!
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Old 01-20-2006, 11:24 PM   #6
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Will it fit under the cowl? I would guess not. Could you (Mike94ZLT1)mesure overall hight in the back? It may fit under my hood but not the cowl.
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Old 01-21-2006, 12:34 AM   #7
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I wouldn't mind the power gains but I dont want to spend the extra $1000+ to get a new hood.

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Old 01-21-2006, 01:49 AM   #8
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I think you can shave down all the hardware to just the bare intake essentials and be just fine. The throttle body is in the right location, everything else can be cut off that intake.

alot of work, but 100 vs 800... big difference.
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Old 01-21-2006, 10:36 AM   #9
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On most of those, how is the peak hp at only 4700-4800 and peak torque at 5700-6000? Sounds like something is backwards?
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Old 01-22-2006, 03:28 AM   #10
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Quote:
Originally Posted by turboc5
Could you (Mike94ZLT1)mesure overall hight in the back?
Sure, I'll be out in the garage tomorrow and I'll get some pictures and measurements. I don't think you guys really understand how big or ugly this thing really is... I don't care if its worth 10hp I wouldn't want it under my hood!
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Old 01-24-2006, 08:54 PM   #11
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Any pix/measurements yet?
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Old 02-05-2006, 05:04 PM   #12
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Default LQ4 Intake

Very interesting. I have a 2001 2500 HD with the 6.0 LQ4 that I am acquiring parts for a mod make over (Hooker Headers, 220/224 114 lsa cam, Heads, Corsa exhaust, Outlaw intake, etc.). Most everyone I have spoke with has recommended going to the FAST 90mm intake and TB but after reviewing this information it may be best to keep what I have.

My question is that I can not find specs TB opening for the LQ4 intake. Does anybody know the diamter meaning is it 78mm opening or 85mm opening?

Does anyone have any recommendations on porting my stock LQ4 intake up to an 85mm and adding an aftermarket TB or based on my mods should I stick with the stock LQ4 intake diameter and just have the stock OEM throttle body ported? Any thoughts would be very much appreciated. I know this a truck question on the Vette forum but the other sites I have been to no one has any information at all regarding this topic.

Thanks!!!
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