Intakes

[Stangman]

The edelbrock 2x4 rpm air gap intake manifold is that as good as let's say the BT or tunnel wedge or even the ford 2x4

[e philpott]

it might have been on par with the BT and Ford med 2x4 IF they would have put a Holley flange on it ..... as delivered NO

[Stangman]

I didn't realize you couldn't use holleys

[machoneman]

http://www.edelbrock.com/automotive/mc/manifolds/ford/dual-quad-bb.shtml

Yup, their own ad copy above states it can't work with square flanged carbs = Holley. It's too bad and looking at the casting itself, I think they'd have a major task to re-tool it for Holleys if not scrap it and start over with a 2nd set of Holley specific molds.

I'd also not hold my breath they ever will....JMO!

[Stangman]

To bad for the price would be great plus they would sell a hell of a lot more if you could put holleys on it JMO

[gdaddy01]

wish they would have made it holley friendly , I am getting tried of issues with the elderbrock carbs

[cjshaker]

A great marketing strategy....to guarantee that they sell more of their 2nd rate carburetors. Unfortunately, it also means that they will never sell the intake to anyone with real performance in mind.

[Stangman]

What do you think the difference in horsepower is between Holley and edelbrock with comparable cfm

[cjshaker]

From all the examples I've seen, a Holley always makes 10-15 more horsepower on your typical street engine. If it's a higher horsepower engine, those numbers are usually a little higher.

[Stangman]

Thanks cj

[Joe-JDC]

I don't normally disagree about carburetors and hp, but with tuning and dyno testing, an Edelbrock/Quadrajet/Autolite/ can make horsepower comparable to the same cfm Holley.  Most folks just bolt on Edelbrocks out of the box and when it is down on power, throw it on the bench and stick an old Holley back on, never really optimizing the Edelbrocks.  Years ago, testing proved if everything is optimized in various carburetor makes, and the sizes are the same, the hp will be very close.  Having said that, a friend bought 4 Holley 750 performance carbs, and tried all of them on the same engine, and one made about 10-11 hp more than the others---same carbs, all set up on the dyno, and one just stood out of the bunch.  I believe the Edelbrock RPM 8V when ported and flow balanced can be just as effective in making horsepower as the BT 8V.  Jay did not test a ported intake, but I have ported them, and the owners started breaking things because of the power produced.  Just saying---  Joe-JDC

[jholmes217]

On a related note, does anybody make an adapter that allows the use of the Ford oval air cleaner used on most dual quad applications in the 1960's if using the Edelbrock Performer RPM Air Gap 2x4?  The standard air cleaner base wouldn't work since the carbs are closer together.

[Joe-JDC]

There are offset adapters that move the carbs so that you can use two 4150 style Holleys.  I don't know about the spacing, though.  Joe-JDC

[e philpott]

it would interesting to know the "real flow rate" of edelbrock carbs ..... I have a feeling that the ebrock 600 does not flow as much as a Holley 600 , same with the ebrock 750 , if so it's not a real apples to apples comparison

[gdaddy01]

how do you keep the eldies from losing the gas out of them when you shut the engine off ? hood clearance is at a premium .