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More Edlebrock questions
#1
'73 Convertible 351c 2V

The previous owner put on a NASA hood, but no plenum or any other Ram Air parts.

I know I can get a Ram Air kit for about $550.

My question is: Can I also use an Edelbrock Performer Air Gap (not the RPM Air Gap), or is there a big enough height difference between it and the stock intake manifold? And if I can, what about a 4 barrel carb?

If I can only do one or the other (New intake/Carb versus Ram Air), I'd rather do the intake/Carb. But I'd like to do both if possible, without too much modification to the Ram Air kit.
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#2
will work but not without heavily modifying the bottom air filter base
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#3
Tnfastbk;108032 Wrote:will work but not without heavily modifying the bottom air filter base

I think I'll do the Intake and Carb, and compare height difference before/after... Then decide if I want to try and alter the Ram Air kit... seems like a lot of effort for what?... a few horsepower?

I'm thinking Edelbrock Performer Air Gap Manifold and their Thunder Series 650CFM carb. If I don't fiddle with teh CAM, and just do the Intake/Carb, by how much do you experts think that will affect power?
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#4
CZ-75;108039 Wrote:
Tnfastbk;108032 Wrote:will work but not without heavily modifying the bottom air filter base

I think I'll do the Intake and Carb, and compare height difference before/after... Then decide if I want to try and alter the Ram Air kit.

I'm thinking Edelbrock Performer Air Gap Manifold and their Thunder Series 650CFM carb. If I don't fiddle with teh CAM, and just do the Intake/Carb, by how much do you experts think that will affect power?

another member is running the air gap and loves it
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#5
Just to 'cheat' a little, you can always go to CompCams site and use their 'CamQuest' utility to get you a 'ballpark' idea of what your mods will do. They have stock replacement cam specs and a whole selection of engine mods that you can bounce against their virtual dynamometer.

If I remember correctly, bigger carb, free-flowing intake, and headers will get you a couple more ponies - but you'll want more. That's where the cam and valve train come into play. You can maximize the 'breatheability' of the engine all you like, but if the cam and valves aren't keeping pathways open during the process anymore than the stock lift and duration, you won't gain much. Think of it as building a 6-lane highway, but only keeping 1 lane on each side open under the overpasses.

Hope that helps.

Eric

[Image: mach1sig2.gif]
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#6
Mister 4x4;108043 Wrote:Just to 'cheat' a little, you can always go to CompCams site and use their 'CamQuest' utility to get you a 'ballpark' idea of what your mods will do. They have stock replacement cam specs and a whole selection of engine mods that you can bounce against their virtual dynamometer.

If I remember correctly, bigger carb, free-flowing intake, and headers will get you a couple more ponies - but you'll want more. That's where the cam and valve train come into play. You can maximize the 'breatheability' of the engine all you like, but if the cam and valves aren't keeping pathways open during the process anymore than the stock lift and duration, you won't gain much. Think of it as building a 6-lane highway, but only keeping 1 lane on each side open under the overpasses.

Hope that helps.

You know... I've read dozens of posts that go into great detail about Camshafts, and this is the best description I have ever come across. That really explains it well. Lift and duration... I get it now.

Thanks!beer
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#7
I don't think there are two different air-gap manifolds for the Cleveland. There is the Perfromer RPM but its for 351 w block. Note the thermostat outlet on the manifold. Go with the RPM air-gap and dont look back! Smile

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#8
Have you considered mating the Edelbrock intake manifold to a Holley 4150/4160? I'm not sure if the height will be correct, but the original air cleaner should bolt up.

-Kurt

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Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#9
comanchepilot44;108089 Wrote:I don't think there are two different air-gap manifolds for the Cleveland. There is the Perfromer RPM but its for 351 w block. Note the thermostat outlet on the manifold. Go with the RPM air-gap and dont look back! Smile

There is a new "Performer Air Gap" but I can't figure out if it is available for the 351c. I'll need to call them. I'd rather get one for idle-5,500 rather than 1,500-6,500 RPM.

cudak888;108093 Wrote:Have you considered mating the Edelbrock intake manifold to a Holley 4150/4160? I'm not sure if the height will be correct, but the original air cleaner should bolt up.

-Kurt

Only beacause I'm looking for this car to be a strong fair weather driver, and I've been reading that Edelbrocks are a little better suited for that purpose as opposed to racing / Higher RPM.

I'm really looking for more low-end torque.
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#10
Guys,
I am currently running the air gap manifold on my 351 cleveland in my 30 Model A and have found that due to not having the exhaust cross over it is very "cold blooded" even in the summer.
Just keep that in mind when making your choice.
Thanks, Jay
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