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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 02-19-2010, 12:41 PM   #1
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Default Ls1 Vs Ls6 crate engine

Can anyone please tell me if an LS6 crate engine is actually worth 50 more HP over the LS1 crate platform? I know that the stock heads flow better along with the associated LS6 cam, but everything that I read via a google search tells me the base LS1 also puts out 400hp at the crank. What is the real difference between these motors?
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Old 02-19-2010, 12:45 PM   #2
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better flowing heads and a little bigger cam I believe.
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Old 02-19-2010, 12:57 PM   #3
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The LS6:
better cylinders heads,
-larger camshaft,
-better-flowing intake manifold,
-bump in compression,
-stronger main bearing bulkheads.
-the LS6 head design features a raised port floor,
-smoother transition at the short-turn radius for improved flow.
- exhaust ports were also altered from an oval to a D-shaped design.

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Old 02-19-2010, 01:42 PM   #4
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Yes it is worth 50 hp
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Old 02-19-2010, 01:49 PM   #5
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The "crate" gm LS6 longblocks that we have are a better buy atm. Esp for $3220 shipped. You wont find the LS1 in the same style for that price. We only have 5 of them left. The LS6 is HONESTLY worth the extra in normal price form, but now, it is even better.
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Old 02-19-2010, 02:19 PM   #6
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Yes, I clearly know the difference between the LS6 and the LS1, but everything that I could find on the net pretty much says.......the LS1 is a 400hp engine. GM Performace rates the LS6 at 405hp. I think that Car Craft bolted one up for a dyno with stock manifolds and the standard Flowmaster exhaust. Out of the crate, it pumped out 410hp and after a 2 hour break-in-period, it made 417hp. This is only a 10-17hp edge over the LS1 with the torque being about the same. Are the numbers for a crate LS1 being fudged a bit to make the engine look healthier??? I always thought the LS1 was a 350hp crank HP engine since A4 cars are dynoing at 280rwhp and the m6 at 300+rwhp......thus factoring in the 15-20 drive line loss.
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Old 02-19-2010, 02:24 PM   #7
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The LS1 was not 400 HP. I am not sure where that was taken from. Honestly, you can take alot of power out of them. Stock for stock (and price for price right now) the LS6 will always have an advantage. Remember, most things are dynoed @ SAE net now (at least GM does) meaning all accessories on it. Including AC/Alt/WP/PS Pump, not some elec water pump. Dependent upon tuning and intake/exhaust design, the LS1 was rated between 310 to 350. That is all though.
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Old 02-19-2010, 02:39 PM   #8
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Quote:
Originally Posted by cali_bear2003 View Post
Yes, I clearly know the difference between the LS6 and the LS1, but everything that I could find on the net pretty much says.......the LS1 is a 400hp engine. GM Performace rates the LS6 at 405hp. I think that Car Craft bolted one up for a dyno with stock manifolds and the standard Flowmaster exhaust. Out of the crate, it pumped out 410hp and after a 2 hour break-in-period, it made 417hp. This is only a 10-17hp edge over the LS1 with the torque being about the same. Are the numbers for a crate LS1 being fudged a bit to make the engine look healthier??? I always thought the LS1 was a 350hp crank HP engine since A4 cars are dynoing at 280rwhp and the m6 at 300+rwhp......thus factoring in the 15-20 drive line loss.
Yeah your "facts" are fucked man.
oh and i bought my LS6 longblock from Scoggins, couldn't be happier, im glad i went with them.
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Old 02-19-2010, 03:16 PM   #9
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Ummmm....my facts are not fucked!!! They are NOT my facts, but rather figures stated in different articles that I have read online. I also have an LS6 crate motor purchased from Pace Performance a few years ago.

This is the attached article from Gm High-Tech Performance.

http://www.gmhightechperformance.com...est/index.html

This is the attached article from Car Craft Magazine.

http://www.carcraft.com/techarticles...yno/index.html

I just would like to know if a stock LS1 really has this much juice....??? OR did they fudge the dyno readings???
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Old 02-19-2010, 04:07 PM   #10
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A stock ls1 is a 350-360 hp motor, nowhere near 400. If it was, there would be guys with bolt on ls1s running around with 400 rwhp, and there aren't. There are some LS6s making that though.

As per your links there, that is certainly a stout ls1 crate there. I wouldn't expect those results again though.

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Old 02-19-2010, 10:56 PM   #11
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Quote:
Originally Posted by cali_bear2003 View Post

I just would like to know if a stock LS1 really has this much juice....??? OR did they fudge the dyno readings???
The latter. The LS1 does not make 400 hp.
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Old 02-20-2010, 10:27 AM   #12
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I had to replace my engine about 2 years ago and it was basically about $1500 more for the LS6 over an ls1 motor. I went LS6 and I am glad i did. compared to the ls1 the ls6 definitely has a higher rpm power band. it really wakes above 3500rpm. i dynoed 344rwhp (most stock ls1 dyno 290-310 there) after the switch with a stock exhaust system. Got long tubes a few months back and I just trapped 111mph in 60 degree air in az. I am happy with the setup.
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Old 02-20-2010, 11:12 AM   #13
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Quote:
Originally Posted by easy_rider View Post
I had to replace my engine about 2 years ago and it was basically about $1500 more for the LS6 over an ls1 motor. I went LS6 and I am glad i did. compared to the ls1 the ls6 definitely has a higher rpm power band. it really wakes above 3500rpm. i dynoed 344rwhp (most stock ls1 dyno 290-310 there) after the switch with a stock exhaust system. Got long tubes a few months back and I just trapped 111mph in 60 degree air in az. I am happy with the setup.
Hello,
Did you dyno at 344rwhp with the stock exhaust or was that after the Lt's and exhaust work?? Just wondering if mine will dyno at pretty much the same numbers.......
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Old 02-20-2010, 05:43 PM   #14
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Quote:
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Hello,
Did you dyno at 344rwhp with the stock exhaust or was that after the Lt's and exhaust work?? Just wondering if mine will dyno at pretty much the same numbers.......
I think he means he dyno'd that with just an exhaust, he just got Longtubes put on.
I'm guessing he's at about 360rwhp with the Longtubes.
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Old 02-20-2010, 08:10 PM   #15
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are those new long blocks ,or rebuilds?
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Old 02-20-2010, 11:29 PM   #16
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Quote:
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are those new long blocks ,or rebuilds?

Try bring more specific n how you ask things.

Depends where you buy it from, mine was brand new from Scoggins, a vendor on this site, now I believe GM Goodwrench long blocks are remans.
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Old 02-22-2010, 11:16 AM   #17
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Quote:
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are those new long blocks ,or rebuilds?
New.



John
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Old 09-05-2010, 11:11 AM   #18
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i am thinking ls6 longblock with a fast 92 intake and throttle body for my 02 t/a ws6 a4.with my current mods(longtubes,ory,magnaflow catback,slp lid)i hope to get close to 400 at the wheels.
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Old 09-05-2010, 12:01 PM   #19
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With just a cam, they will make that no problem. We have taken these and cammed them and made some impressive results. They do make good power with the fast intakes, either the 90/92 or the 102. It is alot easier to see the mods work with a 6spd car on the dyno, or a stalled auto on the strip.

We only have about 8 more of them and then they are GONE! Seriously. GONE.

I am doing a build now on one with CNC milled ls6 heads, cam, and installing our ls7 clutch on it for a customer. Should make some killer power.
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Old 09-06-2010, 01:36 AM   #20
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What are longblock ls6s going for? My car just got a moser 12 bolt and performabuilt stage 2 w/ 2000 stall this year so funds are very tight.also with the trans/stall will the stock ls6 cam cause any issues and what cam would you put in to get to 400 rwhp? Car is a driver that rarely sees the dragstrip and I want to keep factory style driveability just with a little more power than a ls1.I was thinking the scoggin-dickey z+220 cam if it wouldn't hurt drivability.thanks,david
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Old 09-06-2010, 01:36 AM
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