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Old 05-10-2017, 07:03 AM   #1
gesto
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Dorman LS2 Intake Manifold

Dorman has released a new replacement LS2 intake manifold. I'm starting this thread to prevent more crapping of another thread.

I don't know much about it other than what I've scanned through on LS1tech in a thread titled "Intake Flow Numbers: 78mm LS1, 90mm TBSS, 92mm Dorman LS2 & 102mm Fast LSXRT". That thread shows the Dorman Ls2 out flows the truck/TBSS intake a little up to .600 lift. There is another thread as well over there. It is "reportedly" not a replica of the GM LS2 intake but rather, has some commonality with the FAST design.

The part number is Dorman 615901 and various retailers sell them. Prices are around $400.

It may be a disappointment like the Dorman Ls6, or may fit poorly, or it might be a good budget intake upgrade for stock and mild engines. Time will tell.
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Old 05-10-2017, 07:11 AM   #2
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From what little I've read, I have formed the opinion that it would be more of an upgrade for those LS1 intake having f body guys. I obviously wouldn't sell my LS6 for a Dorman LS2 intake. I also don't think I would scrap an LS2 intake and buy the Dorman, unless there was something wrong with my LS2 and I had to buy something anyways.

Regardless, the flow numbers in that thread looked good and the price doesn't seem bad either. I do wish to see more info/comparisons on it though.
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Old 05-10-2017, 07:43 AM   #3
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Quote:
Originally Posted by cookmeup272...View Post
... I obviously wouldn't sell my LS6 for a Dorman LS2 intake...

I beg to differ. If you are rocking a cam only or heads / cam LS1 GTO and want to upgrade to a larger throttlebody. Then this seems like the way to go. Sell your LS6 for $400, buy the Dorman for $400 ... that's a free upgrade. Then all that is required is purchasing a larger 92mm throttle body. Wish I know about this before diving into my TBSS project.
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Old 05-10-2017, 08:15 AM   #4
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Lets say you sell your LS6 for $350 + shipping. And then you buy the Dorman for $450 + shipping. And then now you have to buy a bigger throttle body. How much more power are you actually making for what will probably end up being at least $250+. Obviously I'm just speculating and making assumptions but still. Like I said, it makes MUCH more sense for people with LS1/LS2 manifolds than those of us with an LS6...unless something happened to be wrong with your LS6.
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Old 05-10-2017, 08:19 AM   #5
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I'll post up what i quoted in the other thread and delete the original post. Sorries.

Quote:

Lift_______head_____ LS1(w/o EGR)___TBSS_____Dorman LS2___FAST LSXRT
.100_______64.4_______62.4____________59.2_____61_ ____________64.3
.200______134.5______127____________127.2____127.8 __________134.4
.300______198________174____________179______182.6 __________191
.400______246.5______211____________218.1____225.8 __________235
.450______267________221____________230.2____237.8 __________248
.500______281________230.2__________240.1____247.6 __________260
.550______295.8______238.5__________250.1____248.5 __________270.2
.600______305________242.1__________256.6____252.9 __________278
.650______285________244.3__________261.8____254.6 __________282.3

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Old 05-10-2017, 08:22 AM   #6
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I guess I should have mentioned that my comments were tailored more to my setup/intended use. I am looking more so at the higher lift numbers. I'm also speculating that an LS6 flows a little worse than the TBSS intake. With that being said, I'm assuming the LS6 flows comparable (read slightly better) than the Dorman at high lift.
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Old 05-10-2017, 08:26 AM   #7
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Well i assume the runners and plenum of the dorman LS2 are the same as the dorman LS6. The dorman LS6 flowed worse than the stock LS6, but the plenum mouth is actually smaller, as well.

The TBSS was tested to make more hp and torque over the LS6. I would think based on flow numbers that the dorman LS2 in somewhere in between. Guess that plenum mouth did make a significant difference.
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Old 05-10-2017, 10:38 AM   #8
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I'm one of those F-body LS1 intake guys and this is interesting but I'll spend the extra money for a FAST for room to grow. If the Dorman performs the same or better than an LS6, the value of an LS6 will drop. I expect it to outperform the LS6 myself but that's just a guess.
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Old 05-10-2017, 11:15 AM   #9
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I'd like to see some comparisons between the stock LS2 intake and the Dorman LS2 intake. Probably not a lot of difference, but it'd be nice to know if there was an improvement. I also wonder if the Dorman version is made with enough to it to allow for as much porting as is possible on a stocker. Would really suck to buy one and begin porting it only to find out you just blew through a runner wall.

Also for curiosity's sake, I'd like to know how my ported LS2 measures up to an LS6 or FAST 92 intake. In the end, someone has to start providing products at a price to seriously compete with FAST. Their intakes are a horrible investment with respect to $$$/HP gained, at least for those of us with a stock long block.

It is interesting that the Dorman can be taken apart like a FAST.
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Old 05-10-2017, 11:41 AM   #10
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Quote:
Originally Posted by Rich-Tripower...View Post
I'd like to see some comparisons between the stock LS2 intake and the Dorman LS2 intake.

The factory LS2 intake is a decent design that is horribly executed. The vibration welded technique that was used to make these 3 piece manifolds into one piece quite simply didn't work. There are often huge gaps, air leaks and mismatches inside the ports.

The Dorman is supposedly built better and should perform to it's design intent and I would not be surprised to see a 15HP increase over the LS2 intake manifold on an otherwise stock engine.
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Old 05-10-2017, 12:42 PM   #11
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Quote:
Originally Posted by Abe05GTO...View Post
The Dorman is supposedly built better and should perform to it's design intent and I would not be surprised to see a 15HP increase over the LS2 intake manifold on an otherwise stock engine.

That'd be nice, but needs to be substantialized before I'd plunk down my $$$s. Also, I'd need to know I could port the Dorman as much as I ported my LS2 otherwise it would still be a step backwards.
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Old 05-10-2017, 02:50 PM   #12
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I think the question to ask is how your ported LS2 compares to a TBSS intake, because the Dorman stays inline with the TBSS up to .600" of lift according to the test performed on LS1Tech.
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Old 05-10-2017, 07:49 PM   #13
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Quote:
Originally Posted by cookmeup272...View Post
Lets say you sell your LS6 for $350 + shipping. And then you buy the Dorman for $450 + shipping. And then now you have to buy a bigger throttle body. How much more power are you actually making for what will probably end up being at least $250+.

That's the idea, after you've done headers, heads, cam, etc the last go fast parts are throttle body and intake manifold; if you didn't do some other power adder that would replace them, aka Nitrous or Forced Induction.


LS6 manifolds flow amazing, for what they are. But they are still bottle necked by the 78mm throttle body.

What I never agreed with are the people spending $800+ on a plastic intake & $400+ on a throttle body just to get an extra 20rwhp & tq.

Spending $250 for close to 20rwhp. That's better than anything I've seen so far in dollar to horsepower ratio.



http://www.hotrod.com/articles/20-ls...ifolds-tested/

Peak numbers

78mm tb LS6 = 557hp 483tq
92mm tb TBSS = 562hp 497tq
102mm tb LSXR102 = 591hp 505tq

Average numbers 3k to 7k RPMs

78mm tb LS6 = 432hp 450tq
92mm tb TBSS = 444hp 464tq
102mm tb LSXR102 = 450hp 468tq



They might not make "peak" hp as nice as the 102 intakes but the "usable" power in the rpm range isn't far off.

LS2 intakes are crap. They have a 90mm throttle body yet get out performed by an intake with a 78mm throttle body (LS6).

Last edited by DangerNoodle; 05-11-2017 at 07:21 AM.
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Old 05-11-2017, 09:19 AM   #14
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Rich_Tripower nailed the question that I was only thinking. Sub'd for answers..

>>I'd like to see some comparisons between the stock LS2 intake and the Dorman LS2 >>intake. Probably not a lot of difference, but it'd be nice to know if there was an >>improvement.
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Old 05-11-2017, 10:11 AM   #15
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Quote:
Originally Posted by Logan71...View Post
Rich_Tripower nailed the question that I was only thinking. Sub'd for answers..

>>I'd like to see some comparisons between the stock LS2 intake and the Dorman LS2 >>intake. Probably not a lot of difference, but it'd be nice to know if there was an >>improvement.

Agreed.

The only assumption that can be made is from flow charts from other intake comparisons.

LS6 > LS2
TBSS > LS6
Dorman ≥ TBSS
FAST LSXR > Dorman & TBSS
Fast LSXRT > Than everything.

Price:
LS6 = $300 - $450
LS2 = $250 - $350
TBSS = $100 - $200
Dorman = $350 - $400
FAST LSXR = $850+
FAST LSXRT = $950+
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Old 05-11-2017, 10:46 AM   #16
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Quote:
Originally Posted by DangerNoodle...View Post
Agreed.

The only assumption that can be made is from flow charts from other intake comparisons.

LS6 > LS2
TBSS > LS6
Dorman ≥ TBSS
FAST LSXR > Dorman & TBSS
Fast LSXRT > Than everything.

Price:
LS6 = $300 - $450
LS2 = $250 - $350
TBSS = $100 - $200
Dorman = $350 - $400
FAST LSXR = $850+
FAST LSXRT = $950+

See the bold. Are you talking about the Dorman LS6 or the Dorman LS2?

If the Dorman LS2 provides 2/3 the improvement as a FAST for far less than half the cost that is a better deal right there. But I'm sure FAST sales won't suffer because FAST=racecar.

I've been told my ported LS2 is as good as an untouched FAST but I don't know if I believe that or not. If the Dorman LS2 is better, a ported Dorman LS2 would likely be an even more attractive bargain over the FAST option (especially if you do the porting yourself like I did). Story goes that the Dorman can be disassembled so that would make porting efforts easier and provide the opportunity to do more and more effective porting.

I would assume the Dorman doesn't have posts inside but don't know that for sure.
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Old 05-11-2017, 11:07 AM   #17
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The Dorman does have posts, but that isn't a bad thing.
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Old 05-11-2017, 11:09 AM   #18
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Quote:
Originally Posted by MuhThugga...View Post
The Dorman does have posts, but that isn't a bad thing.

I always heard that removing the posts didn't really improve anything anyway but often caused issues when the epoxy plugs in the manifold floor come loose eventually.
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Old 05-11-2017, 11:34 AM   #19
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Quote:
Originally Posted by Rich-Tripower...View Post
See the bold. Are you talking about the Dorman LS6 or the Dorman LS2?...

New Dorman LS2 in which it is supposedly comparable to the TBSS. (Flow testing that is). Not dyno tested.

Dorman LS6 was bad. Supposedly the NEW Dorman LS6 is better since it is made the same way they are making the Dorman LS2 now. Basically sounds like they took a LS6 and smashed it together with a FAST to make a cheap mid level intake. Something EVERYONE was crying for back in 2009 and 2010 when we were teased by the Weiand Street Warrior. Mythical intake that was comparable to FAST but for only $500 - $600 ... that was never produced... or sold.

Last edited by DangerNoodle; 05-11-2017 at 11:37 AM.
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Old 05-11-2017, 12:12 PM   #20
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Glad this thread was created. Funny too because I've been doing as much digging on this new ls2 intake as I can and I've drawn some conclusions of my own, enough that I've been looking for the best price so I can pick one up.

I already have a new in box 92mm 4 bolt throttle body so that's no issue there. I can tell you this, there's something to be said about the tbss intake because I did a swap on my 2000 5.3 silverado and it made a noticeable difference. Did I dyno it? No. But I did logs on it with my hp tuners and it was faster to 60mph than the stock manifolds which is claimed to be pretty decent. I had a ported throttle body on the stock manifold and a 92mm billet Chinese made (under $100) throttle body on the tbss intake. The differences I saw it it pulled higher Roma because I ended up raising my shift points and it made more bottom end because it when from lightly spinning the tires to being able to spin them from a 20 roll and forget about flat footing from a dead.

The main thing I gather with the dorman ls2 intake (it's being called LS2d on other forums) is it really needs a lightly cleaning up of the ports. They say there's a bunch of casting flash and ridges in there. If that's the case I don't see it having a problem making up the few high lift cfm it's lacking. There's lots of pics over on ls1tech

Looks like I may be picking one of these up soon and possibly selling my ls6 intake. Patiently waiting either a dyno comparison or flow test comparison

Last edited by Kfxguy; 05-11-2017 at 12:17 PM.
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Old 05-11-2017, 12:55 PM   #21
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If the Dorman LS2 pans out, I can see picking one up, porting it and then selling my ported LS2 and coming out pretty good dollarwise on the swap.

I do wish the Dorman didn't have those ugly chunks molded into the top though.
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Old 05-11-2017, 02:10 PM   #22
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Quote:
Originally Posted by DangerNoodle...View Post
New Dorman LS2 in which it is supposedly comparable to the TBSS. (Flow testing that is). Not dyno tested.

Dorman LS6 was bad. Supposedly the NEW Dorman LS6 is better since it is made the same way they are making the Dorman LS2 now. Basically sounds like they took a LS6 and smashed it together with a FAST to make a cheap mid level intake. Something EVERYONE was crying for back in 2009 and 2010 when we were teased by the Weiand Street Warrior. Mythical intake that was comparable to FAST but for only $500 - $600 ... that was never produced... or sold.

it doesn't look dramatically different from the one i examined a while back, at least from the pics i've seen.

i may have to take a look at a new one in person.

i'm sure the bottom and mid sections are still Wilson/FAST 90mm intake rip-offs and the top shell is a still custom deal--hopefully that is the part they redesigned. From what i saw, the top price was the killer, and as was mentioned before, so was the TB inlet size.

Not sure how much material there is to port on the top shell.
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Old 05-11-2017, 03:21 PM   #23
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Mini thread jack but I'm thinking I might buy one of these manifolds and combine it with one of the heat shields mentioned in this article http://www.superchevy.com/how-to/eng...ower-for-less/ . I just need to find someone artsy who can get all the ugly warts off the outside of the Dorman manifold before I proceed.

Last edited by Abe05GTO; 05-11-2017 at 03:29 PM.
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Old 05-11-2017, 03:58 PM   #24
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Quote:
Originally Posted by Abe05GTO...View Post
Mini thread jack but I'm thinking I might buy one of these manifolds and combine it with one of the heat shields mentioned in this article http://www.superchevy.com/how-to/eng...ower-for-less/ . I just need to find someone artsy who can get all the ugly warts off the outside of the Dorman manifold before I proceed.

i find it hard to believe that they gained 18 hp just with a heat shield.
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Old 05-11-2017, 04:01 PM   #25
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Originally Posted by Nothubertjfarnsworth...View Post
i find it hard to believe that they gained 18 hp just with a heat shield.

I agree but then again (until recently) I never would have imagined the difference a DuSpeed would make.

For the cost of the heat shield it's a low risk gamble. You certainly won't lose any HP by using one.
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Old 05-11-2017, 04:41 PM   #26
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Quote:
Originally Posted by Nothubertjfarnsworth...View Post
i find it hard to believe that they gained 18 hp just with a heat shield.

I agree. It may work with the hood open allowing the heat to escape but as soon as the hood is shut and heat fills up the engine compartment, it's going to get hot again. I don't run my car with the hood off and most street cars don't have very good heat evacuation so it's pointless. I was thinking maybe the heat would be drawn out at speed but heat rises and the manifold is at the top. Maybe it didn't heat up as fast, but I'm pretty confident it's going to get hot. I put this in the same category as icing an intake. Bull shenanigans.
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Old 05-11-2017, 05:59 PM   #27
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1. I believe all dyno pulls should be done with the hood closed. Simulate real world conditions damn it!

2. I understand the heat shield idea, granted I'm still skeptical, but that could explain the TBSS's advantage over the other LS intakes. It doesn't sit flush to the valley. Only the runners do, allowing for that valley heat to not transfer directly into the intake.



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Old 05-11-2017, 06:12 PM   #28
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in my experience engine heat still soaks the plastic. any kind of insulation just makes it take longer.
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Old 05-11-2017, 06:15 PM   #29
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Quote:
Originally Posted by Nothubertjfarnsworth...View Post
in my experience engine heat still soaks the plastic. any kind of insulation just makes it take longer.

That was kind of my line of thought. And couldn't you just jam some of that reflective bubble wrap insulation some of us have used to insulate a Vararam under the manifold and get the same effect (if there is any) for about $2?

I still have like 20 feet of the stuff under my workbench.
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Old 05-11-2017, 06:20 PM   #30
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Quote:
Originally Posted by DangerNoodle...View Post
1. I believe all dyno pulls should be done with the hood closed. Simulate real world conditions damn it!

2. I understand the heat shield idea, granted I'm still skeptical, but that could explain the TBSS's advantage over the other LS intakes. It doesn't sit flush to the valley. Only the runners do, allowing for that valley heat to not transfer directly into the intake.




Nah that's not it. The reason it makes good power is it has more plenum volume, good flow and a 90mm throttle body opening. Don't get me wrong, I'm sure the temp might be a tad lower but I still think it's going to heat soak being in an enclosed heated area. The flow numbers on that intake prove to be pretty strong for a factory intake. I know it helped a lot on my truck. Little ole 5.3 at that.

Random Food for thought. I've seen throttle body size debated. People saying you don't need a 90mm throttle body on a stock motor. Well it must do something if gm started putting bigger throttle bodies on the later model motors and every year they make more power. My 2017 5.3 silverado has a huge throttle body on it and it's only 350hp.
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