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  #16 (permalink)  
Old 05-15-2012, 02:20 PM
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Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular

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  #17 (permalink)  
Old 05-15-2012, 02:23 PM
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In that case a single plane manifold would be the best choice If you get too much torque at the low end.
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Old 05-15-2012, 02:24 PM
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The Performer RPM AirGap will make more torque and horsepower at every RPM from idle to 7000 when compared to a Victor type single plane.
Your heads dont flow enough to need a bigger intake.
The difference wont be that great so if you want the single plane for cosmetic reasons, go for it.
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Old 05-15-2012, 02:31 PM
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Silver, try to use a Holley 770 Avenger. DP carb will over react a loose traction when you floor it.
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Old 05-15-2012, 02:44 PM
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The higher shift point from using a manual trans that you think will benefit you w/the single plane intake will not make any improvement in how the truck drives around town.

AFA traction goes you DO have an option to improve the suspension and/or to use tires w/more traction. And unless you want to kill power instead of harness it, you have a uber sophisticated traction modulation system already onboard- your right foot.

The bottom line that should matter to you the most is you will enjoy more power under the curve w/the dual plane than a single plane.
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Old 05-15-2012, 03:56 PM
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Quote:
Originally Posted by lmsport
Your heads dont flow enough to need a bigger intake.
This thought had crossed my mind. If the heads are the bottle neck here, then how much of a difference, if any, would be seen by using a 'performer' intake (idle-5,500) vs performer rpm' intake (1,500-6,500)?
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Old 05-15-2012, 04:10 PM
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The unported Vortec will go to 420 HP on a streetable cam. I would not go to the Performer manifold with your cam and compression and lack of hood clearance issues.
I like the AirGap. I have two cars in my shop now that have vapor lock problems which I attribute in part to the alcohol in the fuel. Both are old muscle cars with block mounted fuel pumps and carbs and have run in the past without this problem. I think the AirGap can only help prevent such issues.
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Old 05-15-2012, 05:15 PM
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Good old "tried and true" single plane intake like this: http://www.ebay.com/itm/WEIAND-SBC-A...item5893f1efef these are used a lot on short tracks and mandatory by some associations where you are restricted to using factory iron heads.They pull hard off the corners so they will make torque ,for the price you could always give it a shot and sell it if it doesn't make you happy.
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Old 05-15-2012, 07:21 PM
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The air gap is equal to or slightly better than the RPM non AG in every test I've seen and even by what I have seen myself. But also what I've seen is that the AG takes longer to come fully up to temp than an intake that has motor oil splashing onto the underside of the plenum and/or a heat crossover. And Vortec heads have no heat crossover.

This is a concern because until the engine and the intake is fully up to temp and the air/fuel mixture is atomizing/vaporizing as it should, if the carb is tuned correctly for full operating temp, the air/fuel mixture will be richer than needed at all points below full temp.
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Old 05-15-2012, 10:33 PM
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single plane intakes

yes.
i have used single planes on and off the track.
i put a torker 2 on my vette because of hood clearance issues.
i hated it. there was a flat spot at 2500 rpm. everytime i went around a corner and tried to accelerate out. i would hit the flat spot. the car would bog and cause the body to roll. i later changed to the rpm airgap and had no flat spot. (using the same carb with no modifications)
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  #26 (permalink)  
Old 05-16-2012, 09:28 AM
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Neither the cam or the rear gears are enough to allow a single plane manifold to work in its best rpm range.

Use the Performer RPM manifold.
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Old 05-16-2012, 01:12 PM
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edelbrock torker intake will work for ya IMO.
better than the performer intakes.
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