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Old 02-09-2005, 02:30 PM
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single or dual plenum intake

hello all,

I have a 72 chevelle. 350 4 bolt, roller rockers 1:6:1 ratio. Holley 670 street avenger carb, torker 2 intake (single plenum), and heavy cam, but not sure on the specs. The motor puts out great power at top end, however sluggish in the bottom. I was told to switch over to an air gap dual plenum intake. Could someone please help me out with this decision.

Transmission is a TH350, and gears are stock 2.73 i believe.

Thanks

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Old 02-09-2005, 02:34 PM
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yep, Id switch to a duel plaine, the TorkerII isnt one of my favorite single plane intakes anyway
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Old 02-09-2005, 02:41 PM
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Considering your gears and the weight of your vehicle a switch to a dual plane would be a wise decision. Cam specs, compression ratio, head type, and the stall on your converter would help narrow it down further, but a Performer or Performer RPM would probably do you good.
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Old 02-09-2005, 02:45 PM
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intakes

Torker 2 single plane, good top end and better than stock bottom. Peeks out at 6500 rpm. Good for stock car or any high rpm use. 1 inch lower for fitting under stock hoods.

Edelbrock Perf dual plane, good bottom for a truck. Peeks out at 5500 rpm.

Edelbrock Perf/rpm dual plane, good bottom and top. Good street rod intake. Peeks out at 6500 rpm.

Edelbrock Airgap/rpm dual plane, good bottom and top. Good street rod intake. Peeks out at 6500 rpm. Good for cars with cooling problems. Bad in colder climates due to carb icing.

I don't think your problem is with your intake. Cam is unknown? Could be your problem. I would invest into a B&M Holeshot 2800 stall convertor before I bought a new intake.
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Last edited by bracketeer; 02-09-2005 at 02:54 PM.
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Old 02-09-2005, 02:46 PM
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Your biggest problem sounds like a mismatch between engine and gears. Install a low rpm torque cam or add higher numeric gears, at least a 3.55 or 3.73.

It is hard to get a 2.73 moving off the line without a bunch of torque.

The performer rpm intake is a step in the right direction.
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Old 02-09-2005, 02:56 PM
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Your rear end gears are definitely a huge part of your problem. Your engine never gets to run in or even near its power band on the bottom end. Manifold is probably a lesser but significant drag on the bottom end too. I would attack the problem by first changing to 3.54 rear gears then if that doesn't get it respectable, go to a Performer Plus 180deg manifold.

Also, any basic topic like this is surely covered in great depth in many threads on this board. Do a search and you will find a wealth of expert knowledge on it.
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Old 02-09-2005, 05:56 PM
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Definitely dual plane that car is too heavy, unless you have a huge cam and tall gears then you will need a stall.
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Old 02-09-2005, 06:04 PM
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will i still have the top end though....it is nice to have
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Old 02-09-2005, 06:29 PM
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Astrops,

If you live in Canada, go with the Performer RPM. Then notch out the plenum divider to give you the upper horsepower you like by doing this. Look at the Performer RPM Airgap, and mimic it.

HERE is a thread started by Bracketeer not too long ago where he did the very same thing of changing from a Torker to a Performer RPM Air Gap. If anyone could give you insight as to the difference, it would be him.

Definitely go to 3.55 or 3.73's for your rear gear. You will be glad you did.

What are your cam spec's? Find out and get with a converter company's tech rep and ask their advice for a converter for your setup. Good luck.

Last edited by wildman926; 02-09-2005 at 09:56 PM.
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Old 02-09-2005, 07:12 PM
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I agree, a performer RPM air gap and some 3.73 gears will make a night and day difference.

Adam
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Old 02-09-2005, 08:40 PM
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as for gear ratio.. as you know i currently have 2.73 non posi.
could i go with just swapping the gears and forget the posi for now...budget reasons...or will i have to go with the posi unit as well.
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Old 02-09-2005, 09:10 PM
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Unless you are going to do it yourself (highly recommend not unless you know what you are doing), why tear into the rear more than you have to? It would cost you more in the long run.

Just be patient, and do it all at once. You will be glad you did. I just did mine, all through out. But, it took me awhile to get everything together. That one legged steed will not do good with gears only, it will just make you more frustrated after being teased with the new acceleration once you finally hook up.
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Old 02-09-2005, 09:19 PM
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I agree with doing the gears and posi at once. If you just do the gears, your car will spin the one tire so much it wont be worth while anyway. I also agree on not doing it yourself. Setting gears correctly can be a challenge even for someone who knows what they are doing.

Adam
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Old 02-09-2005, 10:23 PM
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Definately what these guys said here, get gears, and do it all at once. I was kinda on the opposite end of what you got going on. I have a '71 Chevelle, and bought it with 4.56's and a mini spool already in the 12 bolt. Sure, they had the fun factor, for the first 60 foot, and that was about it, sucked running out of gear prematurely. So I just dropped the cash and bought an Eaton Posi, and a set of Richmond 3.55's. Its not that hard to swap them, just need patience, and helps to have the correct gauges, tools, and a LIFT, lol.

Immediately, it was so much better, not only rpm wise and a much more mature power band, but actually having a real posi was nice. It's only about a 700 dollar swap if you do it yourself. The next day its warm out, I too will be swapping out my single plane xcellerator for one of the dual plane crosswinds. I'll let you know about it if you want, but it probably wont mean much since Im also swapping from an edelbrock carb to a demon, and an old mallory dual point to a MSD HEI.
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Old 02-09-2005, 11:44 PM
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Just another crazy canuck

Intakes;
Have you read my thread on intakes.
http://hotrodders.com/showthread.php?s=&threadid=57364

Convertors;
Get a Convertor. You'll be happy you did.

Rear end;
Ford 9" in a Lemans
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Last edited by bracketeer; 02-10-2005 at 12:06 AM.
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