I agree what was said about the Mast heads as well. On a set of ported 243's it may not even be a huge difference.

But like I was saying why would there be a MAP sensor seal? It's been a while since I had an LS6 intake but I don't remember there ever being a seal back there. Maybe the way the picture looks making me think its an upper seal but it could be the knock out in back with the two vacuum ports in it

 

Note the orange color. When I saw the pic of the inside of the intake on my small phone screen, my first thought was that somebody had inserted a MAP sensor.


But looking at the pic closer, it doesn't seem like it's a MAP sensor:

 

They were even up to 4400 rpm, like some people have said, it would probably be almost equal on a near stock LS1.

I can't wait to see results of the LS2, we pretty much only have porting or FAST as an upgrade.

 

Update from Facebook:

 

Then flaws in the ports were expected but the 72.5mm tb opening wasn't. That alone could be why it was down 7 hp in that dyno test. I would like to see some dyno testing done on one of these after some basic porting done.

 

They're aware of the need for the button head bolts. We discussed it. It was argued at first, until I sent them about 20 threads showing a cracked bottom from not swapping them out.

 

Ohhh, so this thing has the potential with some light touch up work.

 

Dorman should send you an intake free of charge in return for your/our development help. We can use it for further testing purposes.

 

Interesting.

 

Thought I'd chime back in. I received an email from Mike stating that they WILL from now on be including the M8 1.25 x 30 for the valley cover so the bottom doesn't crack when you bolt it on.

Yeah, they should send me one, lol. I already have an LS6 though. I WILL however need an LS3...

 

In for hopeful result after the port work!

 

Now i'm really interested.

 

So it's been a few weeks... no results?

 

i would like to see one with the throat opened up to stock size to see what it does..

 

I read a lot through these posts and various other ones. What is everyone's general feedback on the manifold? Are there other manifolds people are looking for that is not currently available? Any other popular swaps?

Mike
Product Manager Dorman Products Intake Manifolds

 

Nice to see you stop in here Mike!

I'm sure the guys will let you know the general impressions they've had so far. Stick around. There's good ideas circulating here.

 

The factory LS2 intake is known to be a poor performer. A cathedral port that flows like a LS6 but has at least a 90MM TB opening would be interesting.

 

Yep. LS6 everything except a 90mm snout would be cool. I see what you're saying.

 

Mike-
I'll give my opinion, having only seen the intake on here. Take it for whatever it's worth. I think that as a stock replacement part, it will do a fine job. Like others have noted, it falls a little short compared to an oem ls6 on an aggressive setup. But as a stock replacement, as intended, I'm sure the difference would not be noticeable at all between oem and yours. So, mission accomplished. If I ever buy another f-body as a bolt-on only dd, I will definitely buy your manifold.

With that said, if you guys were to fix the little things on this intake that people have pointed out like the ports and added a true 90mm snout, then sell the revised one as the ls2 replacement, I think you will have a money maker. I realize you aren't supposed to be designing performance parts lol hence the whole "just market it as an ls2" deal. Right now FAST and soon to be MSD are the only real intake options for us. Those of us with the old ls1 manifold can either overpay for an ls6 or pay the premium for the FAST. Don't get me wrong. They are very nice pieces. But they have a monopoly and the price reflects that, not to take away from all the R&D that went into their manifolds. What this market needs is a middle option, and you guys have the PERFECT opportunity to be just that. There are a lot of people that need more air than the ls6 can provide, but have a very hard time justifying the cost of a FAST. It'd say at least 75% of people on this board have debated that before purchasing one way or the other. I am one of those people. While I'd call my car a budget build, it would not seem so looking at it. Im just a careful shopper. Your current price is excellent. But I for one would pay a little more money to have all the little kinks worked out. That's where this ls2 replacement could fit right in.

Thanks for coming on here and asking for feedback. Just keep what we have all said in mind. As you can see, word on here travels fast. If you build us a manifold that fits between the oem ls6 and a fast, you won't have to worry about selling it. We will sell it for you. It will be on every LS forum on the web and you'll sell as many as you can produce. I know the people you'd have to get on board with it don't give a damn about our go fast parts, but I reckon they probably like our money, yeah? And a whole boatload full of it, I can assure you. Everybody wins!

 

well said. i hope this part evolves into something.