Which carb Quadrajet or Holley? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-11-2004, 07:11 AM
New Member
 
Join Date: Nov 2004
Location: N.E. Ohio
Age: 66
Posts: 11
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Which carb Quadrajet or Holley?

Hi,
I have a 67 Firebird with a 1973 - 400ci engine with HEI added along with a slight cam when it was rebuilt and automatic transmission. I bought the car this way and don't have any other details about the motor. It has a Holley 650 double pumper with no choke hooked up. I have to stay with a Holley or Quadrajet for the Ram Air kit to work. The carb sits on an older Edelbrock Performer aluminum manifold. I don't want to lose any performance especially take off but I think the carb needs replaced or worked on. The choke isn't hooked up but the car starts pretty good anyway. It will only be driven summers to shows and trips and that seems to be a problem with Holleys, letting them sit. Any suggestions? I was told locally the Quadrajet will perform as good or better than my Holley, what do you think? I want an electric choke and if a Quad is the best one how about a part number. One company told me to go with a M4ME but they come in all different CFMs. I have heard the term Quadrajunk and wonder!!! Any advice and help would be greatly appreciated.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-11-2004, 12:43 PM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I love a properly prepped Q-jet. what max RPM does the motor see ?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-11-2004, 01:00 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Either carb can be a pain in the a** if they aren't in decent shape.

I personally would go with the Q-Jet in your situation. The Holley you have is more for strip use and can be a POS on the street, especially without a choke. In addition, the Q-Jet probably has more cfm than the Holley, and can give you better mileage if you stay out of the secondaries.

You can probably find an electric choke cap in a junkyard for the Q-Jet. Try that with a Holley!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-11-2004, 01:05 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 61
Posts: 16,789
Wiki Edits: 5

Thanks: 19
Thanked 237 Times in 193 Posts
That is not the Holley to have on your "mild" street motor. If you want a Holley, go with a vacuum secondary one. Personally I would go back to the Quad......is the Performer a dual pattern, able to bolt on both carbs? I am sure it is, but you better check.
__________________
Ontario Rodders
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-11-2004, 05:12 PM
Restore60s's Avatar
Member
 
Join Date: Aug 2004
Location: Kentucky
Age: 55
Posts: 291
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Carb to use

A good 750cfm Quadrajet would be the choice. Performance and dependability in 1 package. If you don't want to rebuild your's check out the one's at Summitt Racing. You do not want to use the M4ME or M4MC these came out when "Performance Motors" started to become de-tuned. 1968-1971 is the idea years to stay with the 4MV. They powered the 300 to 390 HP engines both Pontiac & Chevy was putting out. 1970 Q-jets used a 0.076 main metering jet on 300 & 350 HP engines, and Pontiac designated Q-jets on the 455 used the same carb on 375 HP engines. 1969 Q-jets used a 0.066 on the main metering jet on the 350 HP engines while the 390HP engine used a 0.071 main jet. Overall I think if you replaced the carb I would look for a replacement to the 1970 year. That's what we did on our 69 Firebird that was powered with a 455YH engine just running a Lunati Cam, ran great in all rpm ranges without hesitation.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-11-2004, 05:20 PM
Ghetto Jet's Avatar
current hot rod: CTS-V
 

Last journal entry: Lets Get Started With the Improvements
Last photo:
Join Date: Nov 2003
Location: Pennsylvania
Age: 27
Posts: 1,716
Wiki Edits: 0

Thanks: 10
Thanked 4 Times in 4 Posts
Well Holleys are square bore and Q-Jets are spread bore. He has a Holley so his manifold is for a square bore carb(unless he has one of those sucky adapters) All that considered I would stick with the Holley, unless you want to buy a new manifold.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-11-2004, 10:11 PM
poncho62's Avatar
Out of the Loop Moderator
 
Last wiki edit: Streetbeasts links
Last journal entry: at car show
Last photo:
Join Date: Oct 2003
Location: Hanover, Ontario, Canada
Age: 61
Posts: 16,789
Wiki Edits: 5

Thanks: 19
Thanked 237 Times in 193 Posts
A lot of Performer manifolds have both patterns on them. you can mount either.
__________________
Ontario Rodders
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-11-2004, 10:17 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I thought the M4ME was for computer controlled engines.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-12-2004, 06:13 AM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
most performer intakes, all for SBC are both square or spreadbore... just need to use the metal plate for square bore for better seal
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 11-12-2004, 09:03 AM
Restore60s's Avatar
Member
 
Join Date: Aug 2004
Location: Kentucky
Age: 55
Posts: 291
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Carbs

M12600-- M4ME started in 1980 as a 49 State issued carb.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 11-13-2004, 07:23 PM
New Member
 
Join Date: Nov 2004
Location: N.E. Ohio
Age: 66
Posts: 11
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
RPM?

I wish I could be more helpful on info but the car is new to me. THe hold tach red lines at 5000 and I think that is about right for the 400 in 1973 as well as in 67. Any one know different? I really appreciate all the advice on carbs. Anyone have a Summit part # that they can recommend or somewhere else to buy? I really want to go with a new or new rebuilt one since I plan on keeping the car.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 11-13-2004, 08:26 PM
wildman926's Avatar
Never let them see you coming
 
Last photo:
Join Date: Sep 2003
Location: Texas
Age: 49
Posts: 297
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
67firebird,

If you want to stay with Holley, the Street Avenger 770 is hard to beat. It would be perfect for your 400 and "slight cam", plus it should be dead on out of the box for you, but if not, it would be easy to tune. Comes with vacuum secondaries, electric choke, all the goodies for a nice street car such as yours. And, you can get them at a great price on Ebay- Click Here

Hope this helps. Good luck with the new Bird!
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 11-13-2004, 11:45 PM
stepside454's Avatar
Member
 
Last photo:
Join Date: Dec 2003
Location: St. louis area
Age: 47
Posts: 1,074
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If your stayin within 5000 RPMS Id use a Road Demon 625 on your 400.
If your gonna rev up to 5500, Id say a 670 Holley Street Avenger.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 11-14-2004, 08:31 AM
New Member
 
Join Date: Nov 2004
Location: N.E. Ohio
Age: 66
Posts: 11
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Can't find 4MV with electric choke

OK if I were to go with a Quadrajet I still need a year and model car to order it. The 4MV comes up either marine, later model Caddy, like mid 70's80's and no electric choke. I would really like an electric choke model and want to stay away from the deturned models. How about more suggestions? It also looks like Quadrajet has less problems than Hollley if it isn't driven all winter. Thanks
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 11-16-2004, 01:25 PM
Berliner Bel Air's Avatar
Beyond the Sea
 
Last photo:
Join Date: Feb 2004
Location: Berlin, Germany
Age: 51
Posts: 171
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
M4ME's are the only ones with electric choke. Why do some of you guys say these are not as good as the earlier Q-jets (4MV's)?
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 04:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.