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Old 02-28-2014, 07:57 AM
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intake question

I have an sbc 406 with 10.5 compression.holley 750 carb.aluminum ported n polish heads.th350 with 2800 converter. 3.73 rear gear.i have the performer rpm intake now. Looking at the air gap or the victor jr. This is a 71 chevelle with stock non ss hood. Not sure if i have clearance.mostly a street car.what are yalls thoughts or suggestions?

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Old 02-28-2014, 09:45 AM
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Is your question about clearance or performance? If it's about clearance, determine what your stack will be and transfer that height to the top of the motor, maybe pull a string fender to fender then see how much rise you have in the hood the same way. You could also consider a low rise air cleaner.
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Old 02-28-2014, 09:51 AM
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Put a glob of modeling clay (between two pieces of plastic wrap) on the air cleaner and slowly close the hood. That will show how much extra room you have. The Victor Jr manifold is a single plane manifold right? I wouldn't run a single plane on the street, you will loose a lot of low end. How do you plan on using the car?
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Old 02-28-2014, 09:53 AM
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Performance.....would i be better with air gap or victor jr?....also thinking of port matching?would it be worth it?
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Old 02-28-2014, 11:46 AM
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My experience... the Victor Jr. is a good manifold but soft on the low end. Although a single plane manifold has cool factor I would stick with a 2 plane for this app. As far as port matching a manifold, it is always a positive thing to do.
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Old 02-28-2014, 11:55 AM
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Wanna know a good thing to do if your heart is set on a single plane manifold and it fits under your cars hood..........extend the pairs of runners well into the plenum. Even much more so than this example. Bring them in to almost touch each other. It will bring the stronger low end back to ya somewhat.
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Old 02-28-2014, 11:56 AM
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Edelbrock single plane (Victor Jr) vs dual plane (Air-Gap) intake manifolds on the same engine in a dyno test at Westech Performance. Plus a test of the Air-Gap vs Regular dual plane intake manifolds.

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Old 02-28-2014, 04:37 PM
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My thoughts....unless you want the look of the air gap or the Victor ....which is nice, I wouldn't screw around with it. Since it's a streeter you'll most likely never notice the hp gain unless you cruise around town a 6500 rpm. I built a 507" Cadillac and installed a single plane on it....and yes it was the wow factor but it still made gobs of torque at lower rpm.
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Old 02-28-2014, 07:03 PM
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I USE A VIC JR,,,
If you rev your engine up past 6k a lot or have a big engine,then use the Vic Jr.
How much horse power are you starting with? what size are your header primary pipes?
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Old 02-28-2014, 10:56 PM
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The air gap will work. I have a 72 chevelle, with an air gap, 1" riser plate, and a plastic adapter for the air cleaner.

HOWEVER......dont make your air cleaner wing nut bolt too long....itll get ya.
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Old 03-01-2014, 05:30 AM
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Ok thanks alot guys....ill go with the air gap
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Old 03-01-2014, 08:58 AM
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Originally Posted by nvyblue03 View Post
Ok thanks alot guys....ill go with the air gap
From a Performer RPM to an Air gap Performer RPM?
Drive down the road with the sunroof open, start throwing your money out and watch random people fight over it. More productive then what your about to do with it.
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Old 03-04-2014, 02:02 PM
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My friend has an airgap in his 47 chevy p/u street rod. Absolutely zero performance gain for him over the non airgap. However, it does "fill" the tall engine bay in his truck a little bit. He had a T-ram on it years ago and could just about close the hood LOL
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