Holley Projection or Edelbrock Performer Manifold??

[sled_dog]

Holley Projection manifold

http://www.holley.com/HiOctn/ProdLine/Products/AMS/AMSM/300-66.html
No idea how it compares to a stock manifold, or whether its just a stocker with larger throttle bores.

OR

Edelbrock Performer for 87+ heads

No need to post a link here I'd say, its just an Edelbrock performer that fits vehicles with 87+ heads. THe thought here is use a TBI adaptor plate on top of it. Though I may have to bore out the holes on the plate for 2" 454 throttle body I'm going to use.

So what do you guys think? ANyone with experience with either compared to stock would be nice. In case you haven't seen by now, I'm building a 383 with a 454 TB on top and roller cam in the block. I don't want the intake to be the choking point if it comes down to it. Oh and the Holley costs about 40-60 more but I still have to buy the adaptor plate on top of the Edelbrock's price.

 

[Z3PR]

I'd go for one you don't have too use a adaptor. But if you have too use a adaptor, go for a DART, or World Products intake manifold.

 

[sled_dog]

heard that coming. Do they make intakes for newer heads?

 

[Z3PR]

[ QUOTE ]
heard that coming. Do they make intakes for newer heads?

[/ QUOTE ]Not sure.

 

[Thunder]

I would use the holley. Its a good dual plane design and is already bored out and designed to work with a 2" TB.
Why adapt a manifold designed for a carb to fuel injection???

 

[mrk5]

I'll second that. /forums/images/graemlins/waytogo.gif

 

[SUBFAN]

Gives me some ideas too.... /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif

 

[jarheadk5]

If you're serious about using an adaptor, I'd look into one of Edelbrock's Performer Air-Gap manifolds. Every article I've read says they make better power than the standard Performer manifolds.

 

[sled_dog]

no performer rpm for the 87-95 heads. think I will just go the simplest route and go with the Holley.

 

[Z3PR]

[ QUOTE ]
If you're serious about using an adaptor, I'd look into one of Edelbrock's Performer Air-Gap manifolds. Every article I've read says they make better power than the standard Performer manifolds.

[/ QUOTE ]My DART intake manifold is also a air-gap style. So there is more then just Edelbrock too choose from. But I agree, the Air-Gap is the way too go.

 

[Xtreme Off-Road]

You can't use the Holley unit with the 87+ heads. Unless you plan on modifying the manifold to work with the 4 inside bolts(been there, done that, not fun). As stated on the holley site, "Not intended as O.E. replacement for 1987 & later fuel injected trucks."

There is nothing special about this intake. Is is just the P/N 300-64 with the top machined for TBI. It is not designed to improve on the TBI. I should know, I own one.
If I had to do it all over again, I would go with Edelbrock performer Air-Gap and cut the notch in the throat the same way the RPM Air-Gap has, this will help the engine breath by sharing both sides of the TBI. Then use an adapter plate

 

[SUBFAN]

Looks to me like you had the wrong Holley manifold. It seems as if they have a manifold for early AND late heads....

 

[sled_dog]

I like the way people keep listing manifolds I should use that aren't intended for the 87+ heads /forums/images/graemlins/rolleyes.gif I think he may be right about the holley though. THe intake bolt holes don't look right. I don't have a rig here with tbi to take a look at either.

 

[SUBFAN]

Shopping on the internet can be frustrating. Most places are to lazy to put the CORRECT pic with the product. The information I gave came from READING the print at Summits sight, not just looking at the pic.

There are two manifolds. Old and new style heads. The pic is used for both applications....

Keeping that manifold in mind myself /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif