Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

Performer RPM Air Gap fits under 1970 hood

 
Old 01-11-2019, 10:12 AM
  #1  
Crimson Thunder
CF Senior Member
Thread Starter
 
Crimson Thunder's Avatar
 
Member Since: Jun 2015
Location: Doctors Inlet Florida
Posts: 410
Thanked 61 Times in 53 Posts
Default Performer RPM Air Gap fits under 1970 hood

I recently got a good deal on a brand new Performer RPM air gap intake. Edelbrock states in their catalog that will not fit under Corvette hood. Well, with the factory 1970 drop base air cleaner and small block flat hood it fits with a half inch to spare.

The picture I took is with my cheap borescope camera taped to the metal fan shroud(it needed more light). I also used wadded up aluminum foil to check the clearance.


Crimson Thunder is offline  
The Following 5 Users Say Thank You to Crimson Thunder For This Useful Post:
ajrothm (01-11-2019), caskiguy (01-12-2019), F22 (01-14-2019), Primoz (01-11-2019), Rescue Rogers (01-12-2019)
Old 01-11-2019, 11:48 AM
  #2  
resdoggie
1976 Blue-Green L-82 4-sp
Support Corvetteforum!
 
resdoggie's Avatar
 
Member Since: Mar 2011
Location: Some days your the dog and some days your the hydrant.
Posts: 2,969
Thanked 318 Times in 291 Posts
Default

How much space is there between the carb flange and the lid?
resdoggie is offline  
Old 01-11-2019, 01:24 PM
  #3  
Crimson Thunder
CF Senior Member
Thread Starter
 
Crimson Thunder's Avatar
 
Member Since: Jun 2015
Location: Doctors Inlet Florida
Posts: 410
Thanked 61 Times in 53 Posts
Default

I have a Holley HP carb without a choke tower. There is little over a half inch from the vent tube to the bottom of the air cleaner. I used Jenga blocks (exactly 3 inches) in place of the air cleaner to get the measurements.
Crimson Thunder is offline  
Old 01-11-2019, 06:31 PM
  #4  
forman
CF Senior Member
 
forman's Avatar
 
Member Since: Mar 2010
Location: Randolph nj
Posts: 876
Thanked 30 Times in 29 Posts
Default

wont fit with a big block ,,, with the air horns cut off it just makes it.. lol
forman is offline  
Old 01-11-2019, 06:51 PM
  #5  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 2,001
Thanked 346 Times in 327 Posts
Default

According to a discussion I had with Holley tech guy, he said I should have 3/4" clearance between lid a fuel bowl vent. I do not. A little less.
I have 1+1/2" drop base, 3" filter on a 4150.

However, after some exhausting searches I did find custom made brass bowl vents for Holley. They were $35 a pair, OUCH! Instead of the vent hole on top of the brass tube, the hole is on the side. That prevents the turbulence from siphoning fuel out of the bowls. I have yet to install them and plan on having a machinist tweak them on a lathe this winter.

Last edited by HeadsU.P.; 01-11-2019 at 06:52 PM.
HeadsU.P. is offline  
The Following User Says Thank You to HeadsU.P. For This Useful Post:
Crimson Thunder (01-12-2019)
Old 01-11-2019, 07:16 PM
  #6  
MelWff
CF Senior Member
 
MelWff's Avatar
 
Member Since: May 2006
Location: Danbury CT
Posts: 10,314
Thanked 603 Times in 583 Posts
Default

the number I have often heard is 3/8" read post #9 in the thread
https://www.corvetteforum.com/forums...ent-tubes.html
MelWff is offline  
Old 01-11-2019, 07:25 PM
  #7  
cuisinartvette
CF Senior Member
 
Member Since: Oct 2004
Location: Valencia Ca.
Posts: 67,822
Thanked 1,101 Times in 1,013 Posts
St. Jude Donor '05
Default

Probably a disclaimer, who knows what has been done to these cars over the years. Good to know youre not stuck with a puky small intake though.
cuisinartvette is offline  
Old 01-11-2019, 08:00 PM
  #8  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 2,001
Thanked 346 Times in 327 Posts
Default

Originally Posted by MelWff View Post
the number I have often heard is 3/8" read post #9 in the thread
https://www.corvetteforum.com/forums...ent-tubes.html
See your post 19.
I would bet that if the Holley slosh whistles were installed in the bowls, that would change the minimum to something in between 3/8 and 3/4.

Last edited by HeadsU.P.; 01-11-2019 at 08:03 PM.
HeadsU.P. is offline  
Old 01-11-2019, 10:25 PM
  #9  
ajrothm
CF Senior Member
 
ajrothm's Avatar
 
Member Since: May 2006
Location: League City Tx
Posts: 9,298
Thanked 642 Times in 499 Posts
Default

Good post! That answers the question for a lot of people. Now SB guys can run a decent intake and not be stuck with Performers, Torker IIs or other junk intakes, and still be able to run the proper size air filter. Nice job...
ajrothm is offline  
The Following User Says Thank You to ajrothm For This Useful Post:
Crimson Thunder (01-12-2019)
Old 01-12-2019, 02:42 AM
  #10  
OldCarBum
CF Senior Member
 
Member Since: Mar 2016
Location: Napa California
Posts: 2,237
Thanked 373 Times in 321 Posts
Default

Originally Posted by HeadsU.P. View Post
According to a discussion I had with Holley tech guy, he said I should have 3/4" clearance between lid a fuel bowl vent. I do not. A little less.
I have 1+1/2" drop base, 3" filter on a 4150.

However, after some exhausting searches I did find custom made brass bowl vents for Holley. They were $35 a pair, OUCH! Instead of the vent hole on top of the brass tube, the hole is on the side. That prevents the turbulence from siphoning fuel out of the bowls. I have yet to install them and plan on having a machinist tweak them on a lathe this winter.
You might want to look at the vent tubes for a marine Holley. The tubes are shorter and actually bend 180 degrees so the top of the tube faces downward so any fuel in the vent tubes dumps back into the carb just above the quarters.
OldCarBum is offline  
The Following User Says Thank You to OldCarBum For This Useful Post:
HeadsU.P. (01-12-2019)
Old 01-12-2019, 02:50 AM
  #11  
cuisinartvette
CF Senior Member
 
Member Since: Oct 2004
Location: Valencia Ca.
Posts: 67,822
Thanked 1,101 Times in 1,013 Posts
St. Jude Donor '05
Default

Originally Posted by ajrothm View Post
Good post! That answers the question for a lot of people. Now SB guys can run a decent intake and not be stuck with Performers, Torker IIs or other junk intakes, and still be able to run the proper size air filter. Nice job...
but what kind of oil is best? lol
cuisinartvette is offline  
Old 01-12-2019, 06:05 AM
  #12  
terrys6t8roadster
CF Senior Member
 
terrys6t8roadster's Avatar
 
Member Since: May 2012
Location: Allenton Wisconsin
Posts: 1,742
Thanked 173 Times in 169 Posts
Default

Originally Posted by Crimson Thunder View Post
I recently got a good deal on a brand new Performer RPM air gap intake. Edelbrock states in their catalog that will not fit under Corvette hood. Well, with the factory 1970 drop base air cleaner and small block flat hood it fits with a half inch to spare.

The picture I took is with my cheap borescope camera taped to the metal fan shroud(it needed more light). I also used wadded up aluminum foil to check the clearance.

Nice looking engine compartment. Which carb are you using?
terrys6t8roadster is offline  
Old 01-12-2019, 07:46 AM
  #13  
HeadsU.P.
CF Senior Member
 
HeadsU.P.'s Avatar
 
Member Since: Aug 2017
Location: Cool Northern Michigan
Posts: 2,001
Thanked 346 Times in 327 Posts
Default

Originally Posted by OldCarBum View Post


You might want to look at the vent tubes for a marine Holley. The tubes are shorter and actually bend 180 degrees so the top of the tube faces downward so any fuel in the vent tubes dumps back into the carb just above the quarters.
Yes, I saw those. Pretty clever but not really what I had in mind.

Last edited by HeadsU.P.; 01-12-2019 at 07:47 AM.
HeadsU.P. is offline  
Old 01-12-2019, 12:25 PM
  #14  
Crimson Thunder
CF Senior Member
Thread Starter
 
Crimson Thunder's Avatar
 
Member Since: Jun 2015
Location: Doctors Inlet Florida
Posts: 410
Thanked 61 Times in 53 Posts
Default

Originally Posted by terrys6t8roadster View Post
Nice looking engine compartment. Which carb are you using?
Holley HP 650
Crimson Thunder is offline  
Old 01-12-2019, 03:16 PM
  #15  
jb78L-82
CF Senior Member
 
jb78L-82's Avatar
 
Member Since: Oct 2007
Location: Rhode Island
Posts: 6,243
Thanked 427 Times in 382 Posts
Default

Good to know! Thanks.

Can you take the air cleaner off and take a photo with the Holley sitting on the RPM air gap intake on the engine?
jb78L-82 is offline  
Old 01-13-2019, 12:37 AM
  #16  
Little Mouse
CF Senior Member
 
Member Since: Apr 2006
Posts: 4,664
Thanks: 0
Thanked 12 Times in 10 Posts
Default Contend with

Edelbrock has to say the rpm manifold will not fit under stock hood to cover its behind. Because as sure as if they said it would many folks would buy the taller then the original l/48 rpm manifold then stick the factory air cleaner on top of it that was designed to work with the factories lower hight manifold.then they would be faced with phone call complaints to maybe even law suite as to why there was no warning it would not fit. This sounds crazy but true. A woman bought a new winnebego driving it down the road she set the cruze control on, got up went and started making herself a samdwich well of course the winnebego ran off the road. She sued them because there was nothing in the owners manual saying you could not do that and won the case and a money reward from the court.

Last edited by Little Mouse; 01-13-2019 at 12:44 AM.
Little Mouse is offline  
Old 01-13-2019, 09:34 AM
  #17  
Crimson Thunder
CF Senior Member
Thread Starter
 
Crimson Thunder's Avatar
 
Member Since: Jun 2015
Location: Doctors Inlet Florida
Posts: 410
Thanked 61 Times in 53 Posts
Default

Originally Posted by jb78L-82 View Post
Good to know! Thanks.

Can you take the air cleaner off and take a photo with the Holley sitting on the RPM air gap intake on the engine?
I really need to find a way to reinstall my 1/4 spacer so I can reinstall my billet water neck and get rid of that ugly Mr Gasket one and give the fuel line more clearance to the heater hose nipple.

Crimson Thunder is offline  
Old 01-13-2019, 09:46 AM
  #18  
resdoggie
1976 Blue-Green L-82 4-sp
Support Corvetteforum!
 
resdoggie's Avatar
 
Member Since: Mar 2011
Location: Some days your the dog and some days your the hydrant.
Posts: 2,969
Thanked 318 Times in 291 Posts
Default

Get an air filter 1/4" less in height.
resdoggie is offline  
Old 01-13-2019, 10:04 AM
  #19  
jb78L-82
CF Senior Member
 
jb78L-82's Avatar
 
Member Since: Oct 2007
Location: Rhode Island
Posts: 6,243
Thanked 427 Times in 382 Posts
Default

Originally Posted by Crimson Thunder View Post
I really need to find a way to reinstall my 1/4 spacer so I can reinstall my billet water neck and get rid of that ugly Mr Gasket one and give the fuel line more clearance to the heater hose nipple.

Very Nice...Thank You
jb78L-82 is offline  
 


Thread Tools
Search this Thread
Quick Reply: Performer RPM Air Gap fits under 1970 hood


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: