Edelbrock 600 CFM--undersized?
February 23rd, 2022, 09:42 AM
#1
Registered User
Thread Starter
Join Date: Nov 2016
Location: Oklahoma City, OK
Posts: 223
Edelbrock 600 CFM--undersized?
1969 442.
Somewhere along the way, someone replaced the QJ with an Edelbrock 600 CFM carb, and a performer intake. The manual choke is held open with bailing wire. Bitch to start cold. Question--
Original 400 CI, is the 600CFM sufficient to feed the beast? Feels like it doesn't have what it needs. However, it's only on there until I get time to install the Holley EFI QJ kit (early summer?)
edit; I do have the original QJ but it's in a basket and missing parts. That's how I got it. I will have it restored at some point.
Somewhere along the way, someone replaced the QJ with an Edelbrock 600 CFM carb, and a performer intake. The manual choke is held open with bailing wire. Bitch to start cold. Question--
Original 400 CI, is the 600CFM sufficient to feed the beast? Feels like it doesn't have what it needs. However, it's only on there until I get time to install the Holley EFI QJ kit (early summer?)
edit; I do have the original QJ but it's in a basket and missing parts. That's how I got it. I will have it restored at some point.
Last edited by Bryan Burch; February 23rd, 2022 at 09:44 AM. Reason: more info
February 23rd, 2022, 09:48 AM
#2
Administrator
Join Date: Oct 2009
Location: Poteau, Ok
Posts: 40,788
It should run ok with that carb for a while. I wouldn't do anything until you get the EFI on it. Your cold start issue probably is not the choke wired open, you just need to operate the throttle until it warms a bit.
February 23rd, 2022, 10:22 AM
#4
Registered User
Thread Starter
Join Date: Nov 2016
Location: Oklahoma City, OK
Posts: 223
February 23rd, 2022, 12:00 PM
#5
Registered User
Join Date: Feb 2013
Location: Phoenix, AZ
Posts: 14,134
Are the older ones square bore only? Edelbrock's web site says the current ones are dual-flange:
https://www.edelbrock.com/performer-...atin-2151.html
Edelbrock Performer Olds 455 Intake Manifold for 400-425-455 c.i.d. Oldsmobile V8 Engines.
Includes Exhaust Crossover Plugs #2733, which Must be used for Marine and Off-Road.
Accepts OEM or 4150-Style Carburetors.
Non-EGR
https://www.edelbrock.com/performer-...atin-2151.html
Edelbrock Performer Olds 455 Intake Manifold for 400-425-455 c.i.d. Oldsmobile V8 Engines.
Includes Exhaust Crossover Plugs #2733, which Must be used for Marine and Off-Road.
Accepts OEM or 4150-Style Carburetors.
Non-EGR
February 23rd, 2022, 12:56 PM
#6
Registered User
Thread Starter
Join Date: Nov 2016
Location: Oklahoma City, OK
Posts: 223
Are the older ones square bore only? Edelbrock's web site says the current ones are dual-flange:
https://www.edelbrock.com/performer-...atin-2151.html
Edelbrock Performer Olds 455 Intake Manifold for 400-425-455 c.i.d. Oldsmobile V8 Engines.
Includes Exhaust Crossover Plugs #2733, which Must be used for Marine and Off-Road.
Accepts OEM or 4150-Style Carburetors.
Non-EGR
https://www.edelbrock.com/performer-...atin-2151.html
Edelbrock Performer Olds 455 Intake Manifold for 400-425-455 c.i.d. Oldsmobile V8 Engines.
Includes Exhaust Crossover Plugs #2733, which Must be used for Marine and Off-Road.
Accepts OEM or 4150-Style Carburetors.
Non-EGR
February 23rd, 2022, 02:58 PM
#10
Proud Viet Nam Veteran
Join Date: Dec 2006
Location: Rowlett, TX
Posts: 10,071
Sorry I gave you bad info on the manifold. If it were mine I would send the Q-Jet out and have it rebuilt and then put it on instead of the Holley FI. You will save a lot of money and headaches.
Thread
Thread Starter
Forum
Replies
Last Post
