Single plane holley street dominator/Quadrajet on a 283?

paris63 · Addicted!

Single plane holley street dominator/Quadrajet on a 283?

jonathanD · Poncho Master!

6 pack? you already have one lol =)

73SC · A Poncho Legend!

Changing from your two barrel to that single palne 4 bbl option you will likely feel a great loss in low end performance. Rochester two barrels can flow up to 590 cfm plus that single plane is for high revs.

paris63 · Addicted!

Thanks Ray! I appreciate the instant knowledge. Would an edelbrock performer be better? or would you recommend flogging the quadrajet and staying with the 2 barrel?

rabbit64cs · Canadian Poncho Superstar!

been there done that, pretty much did the same swap other than it was an old SP2 smalll dual plane with the addtion of headers. The engine was a dog until 3200 RPM,, then it climbed real quick and pulled till about 5200 . It was such a dog out of the hole , It was in a 50 chevy truck that was sub framed with a 3.08 gear. I compensated with a 2200 street stall to get it up out of the hole .

IMHO ..leave it alone !

-- Edited by rabbit64cs on Monday 30th of May 2011 06:07:26 PM

73SC · A Poncho Legend!

The Performer is pretty much a copy of the Bowtie hi rise that GM made for Hi Perf applications. I personally like it. The quadrajet will work welll on it from off idle to about 5,000 rpm.

paris63 · Addicted!

yep, the 63 parisienne isn't exactly light on her feet. I need all the help I can get off the line!!! Good to hear about the performer. I will investigate further. Thanks again!

427carl · A Poncho Legend!

I think a Dual plane intake is more of what you are looking for the Quad is good

jonathanD · Poncho Master!

get a second quad and run what pete does?

67SD396 · Poncho Master!

paris63 wrote:
yep, the 63 parisienne isn't exactly light on her feet. I need all the help I can get off the line!!! Good to hear about the performer. I will investigate further. Thanks again!

Nice car! I have to agree on the performer intake. You want to make as much torque as you can. You would be very sad with the performance of your car with Holley intake because the drop in torque would be so much. It would feel as though you lost hp compared to the two barrel.

64ragtop · Addicted!

...don't run a single-plane manifold on the street, especially on a full-size Pontiac and especially with an otherwise-stock 283. All the guys here are right; you want a dual-plane manifold that optimizes power/torque from 0-4000 RPM. Torkers were designed for high-revving engines that made most of their power over 4000 RPM. We run a dual-plane Edelbrock Z/28 clone (got it used from one of the great guys here) with a Holley 600 (also from one of the great guys here) and duals - runs great...

64ragtop · Addicted!

...sorry, you said Street Dominator not Torker but the same advice still applies..as a general rule don't run a single-plane on the street

paris63 · Addicted!

Thanks for all the advice! I will be avoiding any single plane setup up from here on out, believe me. This is such a great site and I really appreciate the free flowing expertise. I am in no way a mechanic, but I absolutely love my old pontiac. Its really helpfull when I can post a question and the experts instantly answer. So again, big thanks!

73SC · A Poncho Legend!

Just thought of another point to make. Quadrajets are variable flow Carburetors, most like the one you have flow up to 750 cfm. What this means is that the carb will flow to the demands of the engine so if your engine requires 600 cfm on full throttle that's what you will get. They are also known as spreadbores which means the primary bores are smaller than the secondaries. The primaries are much smaller than the Rochester two barrel so you would achieve fuel mileage gains in normal driving conditionsby going to the quadrajet with power on demand when WOT is invoked.

If you go with a Holey or Edelbrock they are usually square bores so no real fuel consumption gains as all bores are the same size. You wouldn't need more than 600 cfm on that 283 and as I mentioned earlier the Rochester two barrel can flow to 590 cfm.

The overall performance of the engine may not change too much but you will likely move the torque and power bands to more usuable ranges with the dual plane and 4 bbl.

59poncho · Poncho Master!

i put an aluminum dual plane intake with a rochester on my stock 283, had headers but put the rams horns back on. I have not yet driven it so i cant tell you how it works but it sounds really good!!LOL Looks good too!