Just wanted to say that I talked to Steve Whipple (Edelbrock rep) at Sema, and he comfirmed that the LT1 intakes are ready and that the LT4s will be availabe soon. Here are a couple of pics I took of them....

 

What are the advantages to them over stock besides looking cool?

 

That's basically it...

 

Do you think they are set for 52MM throttle-body, or larger (58mm)? - Answer included below...

DESCRIPTION: The Edelbrock Performer RPM Air-Gap LT1/LT4 intake manifolds feature a tunnel-ram design that offers performance increases in the
1500-6500 RPM range. The Air-Gap design separates the runners from the hot engine oil, resulting in a cooler, denser charge for more power.
Manifold #7107 is designed to fit 1992-1997 GM LT1 engines, and is matched to our Performer LT1 cylinder heads #61909. If using OEM cylinder
heads, gasket matching of the cylinder head intake ports is recommended for optimum performance. The #7109 is designed for 1994-1995 GM LT4
engines. #7109 will also fit 1992-1997 LT1 engines that have installed LT4 style cylinder heads. The #7109 is matched to our Performer LT4 cylinder
heads, #61939. It may also be used with our Performer LT1 cylinder heads #61909, with minor port matching of the cylinder head recommended for
optimum performance. With OEM LT4 cylinder head applications, such as 1994-1995 LT4 engines, or 1992-1997 LT1 engines with LT4 heads, port
matching of the cylinder head is useful for optimum flow Both manifolds accept stock or aftermarket fuel rails and include an OEM style throttle body
pad that will accept oversized throttle bodies up to 58mm.

• KIT CONTENTS:
1 Splash Shield (Installed on bottom of intake manifold)
4 3/4” NPT Pipe Plug With Thread Sealer (Installed on bottom of intake manifold)
4 1/4” NPT Pipe Plug

• EGR SYSTEMS: The Performer RPM Air-Gap LT1/LT4 intake manifolds are intended as a direct functionally identical replacement for their O.E.M.
counterparts. All exhaust emissions or emissions related stock components are intended to be retained and functional. EGR systems are used
on most 1972 and later model vehicles. Check local laws for requirements.

• THROTTLE BODY RECOMMENDATIONS: Performer RPM Air-Gap LT1/LT4 intake manifolds feature a throttle body pad that will accept OEM and
oversized throttle bodies up to 58mm. For optimum performance, match with Edelbrock throttle bodies. Edelbrock offers two throttle bodies for
1994-1997 LT1 applications; a 52mm (#3809) and a 58mm (#3810).
• THROTTLE CABLE & ACCESSORY BRACKETS: Manifolds will accept factory throttle cable and accessory brackets.
• GASKETS: Do not use competition-style intake gaskets for this street manifold. Due to material deterioration over time, internal leakage of
vacuum, oil, and coolant may occur.
INTAKE MANIFOLD REFERENCE RECOMMENDED GASKET
7107 LT1 GM #12524653
7109 LT4 GM #12367777

 

Well if all goes well I will test one out next year and do a side by side comparison from my GM LT4 manifold and the Edlebrock LT4. I doubt you will have sealing issue. As long as the mating surfaces are flat it will seal.

I like the fact that the recomended LT4 gasket is the 7777... The ports will probably not need much work. If the runners are longer as stated then you will make more power over the stock unit.

I just wish they didnt debut this manifold at SEMA last year... and then debut it again this year, lol.


I guess they are going to come out with an LT4 head also.

 

For those of you with a hardon over the "airgap" did you ever stop to think it is hot air that has just been through the radiator that is flowing underhood???? Would be AFR better off to insulate the intake with a coating to just keep the air from your cold air intake cold.

 

what's w/ the hole in the back of the intake between the EGR crap?

 

I know one of the big delays in production was getting the sand out of the EGR passage and they were going to drill it so I think it safe to say yeah the extra hole is more EGR machining.

 

I dont think anyone had a hardon for the air gap. But air gap manifolds have proven to transfer less heat. 120* air has less BTU's of heat than 190* oil and coolant temps. Pop the hood at the track and thie air gap will cooldown much quicker than a stock intake. The big deal here is they are going to make the first aftermarket intake for the LT1 ever! And with the recent stoppage of LT4 intake production, the market is in need of any replacement. Even if an Edlebrock LT4 intake provides 0 HP gain over a stock unit they still sell for $200-$300 less.... thats what the big deal is. But from what it looks like this intake might have some potential. A year late, but possible potential


I just bought a genuine LT4 manifold. I got it for a reasonable price of $650... and it still needs major porting to match the 7777 gasket I am using. Edlebrock's LT4 already appears to be cast to match the 7777 gasket.

Oh, and coating the intake is not a bad idea. Its already been done to stock manifolds

 

Yeah but the coatings most people use cost too much and are not as good as some of the alternatives. Hint ceramic is NOT anywhere near the best for the intake and a much better solution can be done at home.

 

Statements like that really build confidence in Edelbrock.

They actually built the first one back in 1995, and had it on display at all the shows, in the catalog, advertised in magazines...... but, oooops, they never actually sold one.

 

As the owner of a set of LT4 heads, I think this is great news!!

 

Yeah I rememebr hearing you say that. I bet this is the exact same one from 95. They just pulled it off the shelf, blew the dust off and figured "hey, lets finish this project since we might be able to make money on it this time!"

 

The one from 1995 didn't have the "air gap".... it was a direct clone of the stock LT1 intake.

My question is, how much does the "air gap" reduce the plenum volume, which is one of the weak points of the stocker.

I'm also not sure how longer runners will increase power, since making the runners longer will generally enhance low end torque, not peak HP. Look at the L98.... more torque than an LT1, but runs out of breath at 5,000rpm.

My Formula just sits in the garage collecting dust.... maybe I could start selling off parts like the LT4 intake and recover some of the money I sunk into it

 

Lost interest?