Edelbrock intakes
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,069
Likes: 2
From: Sherwood Park AB
Edelbrock intakes
I currently have a Performer intake for my 400 sbc with ported camel hump heads and a Qjet.
I am planning on gasket match porting the performer intake to match the heads. Before I do that, would it make much of a difference to go to a Performer RPM or Performer Air Gap intake? I know they won't fit under the stock hood.
Also, why isn't there a spreadbore RPM Airgap intake?
I am planning on gasket match porting the performer intake to match the heads. Before I do that, would it make much of a difference to go to a Performer RPM or Performer Air Gap intake? I know they won't fit under the stock hood.
Also, why isn't there a spreadbore RPM Airgap intake?
Safety Car
Joined: Mar 2009
Posts: 3,558
Likes: 4
From: Oakland California
I would say so, if you have a cam that works past the 5500RPM you're going to want to go with the Performer RPM since it makes power all the way up to 6500RPM, the air gap intake is suppose to keep the air flow cooler. Matching the cam with the intake is also important. What cam are you running? I too am curious as to why they don't have a spreadbore RPM intake.
Race Director
Joined: Jan 2000
Posts: 13,018
Likes: 2,262
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
Unless those are some VERY seriously ported double humps with a lot of cam...I doubt the Performer is holding you back any.
Few people run spread bore carbs once they get to the HP and RPM that the Air Gaps will support. Doubt they would sell many.
JIM
Few people run spread bore carbs once they get to the HP and RPM that the Air Gaps will support. Doubt they would sell many.
JIM
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 65
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
Cruise-In VIII Veteran
St. Jude Donor '07
Just FYI, here are a few different intakes and their differences from a RPM intake. All are sitting on the front and rear seal area and measured at the same relative place at the carb mount surface. The intake on the far right is the Edelbrock air gap,Q jet base permastar intake part no. 26012.
Thread Starter
Burning Brakes
Joined: Dec 2002
Posts: 1,069
Likes: 2
From: Sherwood Park AB
I am running an XE-262 cam, rpm from 1300 to 5600 rpm. I guess I don't need an intake that makes power past 5500 rpm.
Thanks, looks like you guys saved me some money.... maybe to buy some driveshaft/halfshaft loops.
Thanks, looks like you guys saved me some money.... maybe to buy some driveshaft/halfshaft loops.
Last edited by rexx78; Jan 24, 2010 at 11:58 AM.
Race Director
Joined: Jan 2000
Posts: 13,018
Likes: 2,262
From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
GREAT PICS c69vete...those really help people!
I should have been more clear....I was thinking of the RPM series of intakes...not just the Air Gaps in general.
That 400" motor could use a sweet set of heads to really feed it!!
JIM
I should have been more clear....I was thinking of the RPM series of intakes...not just the Air Gaps in general.
That 400" motor could use a sweet set of heads to really feed it!!
JIM
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 65
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
Cruise-In VIII Veteran
St. Jude Donor '07
Thanks 427HOTROD and project80. I have these lying around and since there are so many "will this fit" threads, I thought this might help answer those questions.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Yes the Air Gap on the end is a Performer Air Gap not the RPM Air Gap, that one would be the same height if not a bit taller than your tallest RPM manifold there. ?
Nice work with the measurements
They will all fit, even the Vic Jr with drop base air cleaners and with a little work and imagination you can get other manifolds to work that don't fit out of the box.
Nice work with the measurements
They will all fit, even the Vic Jr with drop base air cleaners and with a little work and imagination you can get other manifolds to work that don't fit out of the box.
Racer
Joined: Mar 2008
Posts: 428
Likes: 0
I currently have the Z28 intake on my 1980 and was wondering about hood clearance if I switched to an RPM. It's people like you that take the time and trouble to put a post like yours together that make this forum the great site that it is. Again, thanks.
Safety Car
Joined: Nov 2005
Posts: 3,961
Likes: 573
From: Lompoc, CA. Santa Barbara County
I think the far right manifold is the Performer RPM Q-Jet, but it is not an "airgap". I'm not sure how much the "airgap" part is needed on street cars. I ran old performers and a 70's LT1/Z28 Chevy manifold modified for Q-jet, but I finally moved on up to the RPM air gap about a month ago after a tech from Edelbrock insisted that I was leaving 15-20Hp on the table. I don't think he was just trying to sell me a manifold. The air gap part does work. Drive the car hard, get it good and hot, but the intake runners stay cool to the touch. Also, with the air gap, you can install hoses to run water from the back of the heads up to the thermostat housing.
Bee Jay
Edit: My bad. I guess it is an Air Gap, but without the air gap under the thermostat housing like mine.
Bee Jay
Edit: My bad. I guess it is an Air Gap, but without the air gap under the thermostat housing like mine.
Last edited by Bee Jay; Jan 24, 2010 at 12:15 PM.
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 65
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
Cruise-In VIII Veteran
St. Jude Donor '07
As mentioned above, they do not make the air gap RPM intake for the Q-jet carb. Only the square bore. Not sure if the RPM air gap square bore is taller than the RPM. A look at the Edelbrock site might answer that question
On my 69 I currently run the Performer RPM with an edelbrock carb, a 3/8th inch phenolic heat shield, a drop base ait filter assembly and a 2 1/2 inch air filter with a LT-1 hood. I do use a screw to bolt the cleaner assembly down, not a stud and wing nut. Like you say, you can make a lot of things fit.
Yes Bee Jay, that is an air gap. Edlbrock part no 26012. The second from the left is the standard q-jet performer intake.
On my 69 I currently run the Performer RPM with an edelbrock carb, a 3/8th inch phenolic heat shield, a drop base ait filter assembly and a 2 1/2 inch air filter with a LT-1 hood. I do use a screw to bolt the cleaner assembly down, not a stud and wing nut. Like you say, you can make a lot of things fit.
Yes Bee Jay, that is an air gap. Edlbrock part no 26012. The second from the left is the standard q-jet performer intake.
Last edited by c69vete; Jan 24, 2010 at 12:23 PM.
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
The RPM Air Gap is a good manifold. I made almost the same HP / Tq numbers with the Air Gap and Vic. Jr on my 355ci motor.
The Vic. Jr did beat it by a couple of ponies up top but contrary to popular myths the Vic Jr also made the same or more Tq down in the lower RPM's.
If I was going to run a dual plane manifold for any reason it would be the RPM Air Gap
The Vic. Jr did beat it by a couple of ponies up top but contrary to popular myths the Vic Jr also made the same or more Tq down in the lower RPM's.
If I was going to run a dual plane manifold for any reason it would be the RPM Air Gap
Race Director
Joined: Jun 2000
Posts: 10,046
Likes: 675
From: FL
I am running the Performer RPM Q-Jet 7104 under a stock hood. Just takes a drop base aircleaner.
I am probably losing more HP to losing the stock cold air intake than I am to not being an Air Gap design. My next project is going to be some kind of cold air intake.
Here are some pics. Performer 7104, Q-Jet, Moroso Low Profile Racing Aircleaner with 3" filter (slight massaged for pump arm clearance).
I am probably losing more HP to losing the stock cold air intake than I am to not being an Air Gap design. My next project is going to be some kind of cold air intake.
Here are some pics. Performer 7104, Q-Jet, Moroso Low Profile Racing Aircleaner with 3" filter (slight massaged for pump arm clearance).
