Single plane vs. dual plain - Chevelle Tech
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post #1 of 20 (permalink) Old Feb 20th, 08, 12:22 AM Thread Starter
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Roland
 
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Single plane vs. dual plain

Basic questions need to be answered for me. Help. I am building my 402 right now and it will be for the street. I am using a voodoo hydralic roller cam and running 10:1 comp. on a 331 rear - 4 speed. ok what will serve me better and fit under a cowl hood on my 70 SS, A quadrajet, holley, carter? what about high rise, single plane / dual plane, aluminum / cast iron? what are the best in performance 1500 - 5500 rpm range?


Thanks for the help.....Roland in NY

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post #2 of 20 (permalink) Old Feb 20th, 08, 12:38 AM
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Re: Single plane vs. dual plain

Edelbrock Performer.
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post #3 of 20 (permalink) Old Feb 20th, 08, 12:48 AM
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Walter
 
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Re: Single plane vs. dual plain

Holley 750 3310, or Holley SA 770, Performer intake. But you will get the power bug, so you might as well get the Performer RPM.

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post #4 of 20 (permalink) Old Feb 20th, 08, 2:08 AM
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Re: Single plane vs. dual plain

Quote:
Originally Posted by wildman926 View Post
Holley 750 3310, or Holley SA 770, Performer intake. But you will get the power bug, so you might as well get the Performer RPM.
I agree
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post #5 of 20 (permalink) Old Feb 20th, 08, 2:47 AM
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Re: Single plane vs. dual plain

I found in the past on my 355 SBC powered Vette, that the Edelbrock Performer RPM (not the air gap one) as well as the low-rise single plane Weiand "Team G" manifolds performed the best out of the ones I tried on the car. However, since I didn't use a choke on my Holley carb, I also found that the Performer RPM manifold was a bit more street friendly because it had an exhaust crossover duct through the middle that served to warm up the intake quicker than the single plane Team G manifold did, since the Team G did not have the exhaust cross over. So with the Team G single plane manifold, the engine would run lousey during the first 15 minutes after start-up. And on the nights when the temps would drop into the 50's and sometimes even in the 40's, it was very noticeable. With the Performer RPM intake, it was only a bit shakey in the way that it ran for the first 5 minutes.The Performer RPM was also decent for throttle response beginning at 1,500 RPM,whereas the single plane low rise Team G didn't begin to offer throttle response until 2,000 RPM.

70 Chevelle SS clone (632 CI powered).
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post #6 of 20 (permalink) Old Feb 20th, 08, 6:57 AM
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Re: Single plane vs. dual plain

IMO, for a fairly mild street 402, I think a q-jet would make a real nice carb. When setup properly, they are very reliable, great throttle response and mpg's and still rival a Holley in the power department. Sean at SMI can taylor a carb to your specific engine/drivetrain combo. Very reasonable prices. I think a Stage 2 carb would best suit your needs.

http://www.smicarburetor.com/products/?sfID1=28&sfID2=9

As far as intakes, a Performer would work well, but I would be more apt to look at the Performer RPM Q-Jet manifold. Same as the regular Performer RPM but setup up to accept a spreadbore carb.

http://store.summitracing.com/partde...4&autoview=sku

Darren
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post #7 of 20 (permalink) Old Feb 20th, 08, 7:29 AM
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Re: Single plane vs. dual plain

I would look into a Q-jet. Sean at SMI did one me a about 4 years ago and it was a great running carb. Replaced a 750 Eddy and there was absolutely no comparison between the two. Throttle response was very good and was very reliable. This was on a 383 with a HR cam 219/227 @.050 lift was .510 on a 110lsa performer rpm, and sportsman heads. It was a 4000 lb car with a 700r4 and 3.42 gear. Best time was a 13.70 @ 101 mph. Great carb.

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post #8 of 20 (permalink) Old Feb 20th, 08, 8:36 AM
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Re: Single plane vs. dual plain

Quote:
Originally Posted by wildman926 View Post
But you will get the power bug, so you might as well get the Performer RPM.
There was no difference in ET or MPH at the dragstrip when I swapped from a Performer 2-0 to an RPM on my 454
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post #9 of 20 (permalink) Old Feb 20th, 08, 8:42 PM
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Re: Single plane vs. dual plain

What about running edelbrock Air Gap on the street? I just bought one to replace my current performer RPM.

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post #10 of 20 (permalink) Old Feb 20th, 08, 8:51 PM
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Re: Single plane vs. dual plain

Quote:
Originally Posted by DEEBOO View Post
What about running edelbrock Air Gap on the street? I just bought one to replace my current performer RPM.
IMO, and based on my own experience, with the air gap, I would highly recommend running a choke on the carb since there isn't a heat crossover in that manifold, unless you're only gonna drive the car when the air temps outside are 80+ degrees even at night time. If there's any chance that some nights that you drive home, the air temps will be in the 60's or 50's, then the air gap w/out a choke on the carb will cause the motor to stumble and hesitate for the first 15 minutes of operation. If that wouldn't bother you, then it's no big deal, but that's the way it was on my 73 Vette that had a 350 engine. I tried 5 different manifolds to test out which was best.

Just keep in mind that it wouldn't matter if you happen to have aftermarket cylinder heads that do NOT have ports in them for the heat crossover. Because if they do not, then even if you had a manifold with the heat crossover, it wouldn't be any different anyway since there wouldn't be any exhaust heat going through the crossover anyway.

70 Chevelle SS clone (632 CI powered).
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post #11 of 20 (permalink) Old Feb 20th, 08, 8:53 PM
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Re: Single plane vs. dual plain

Don't use a BB Performer on anything besides a motor home. With 3.31s you will be better off with a Q-jet and a dual plane that has runners the size of the intake ports.
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post #12 of 20 (permalink) Old Feb 20th, 08, 11:49 PM
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Re: Single plane vs. dual plain

Quote:
Originally Posted by BillyGman View Post
I tried 5 different manifolds to test out which was best.
What did you end up going with?

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post #13 of 20 (permalink) Old Feb 21st, 08, 1:22 AM
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Re: Single plane vs. dual plain

Single Plane for racing
Dual Plane for street
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post #14 of 20 (permalink) Old Feb 21st, 08, 7:32 AM
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Re: Single plane vs. dual plain

I was just going to mention Weiand's old 8005 dual plane as being a dandy for a Q-Jet, imho.

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post #15 of 20 (permalink) Old Feb 21st, 08, 7:54 AM
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Re: Single plane vs. dual plain

Quote:
Originally Posted by racecar100 View Post
Single Plane for racing
Dual Plane for street
I would argue that point!! Ede Performer RPM on 505 pumpgas cubes, running low 10's
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