Carb recommendations for a ZZ4?
Thread Starter
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
Carb recommendations for a ZZ4?
Knowing very little about domestic carbs (I'm more of a LBC guy), just bought a ZZ4 and it came with a Edelbrock 750 the guy had purchased for it. I think I read that GM used a Holley 750 (?) in their engineering of the motor. Differences, pros/cons, advantages or disadvantages of the Edelbrock vs Holley (or anything else for that matter)??? Would another carb be a better fit for the engine?
Still learning, and thanks for the advice!!!
Still learning, and thanks for the advice!!!
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
I tried both a 600 and 750 Edelbrock's, which I really liked on other cars, but for some reason the ZZ4 didn't seam to like them. I couldn't get the carbs to work at both cruise & WOT. They could be tuned for one or the other, but I just couldn't get them set the way I wanted. Finally I took the plunge and bought a new carb.
I ended up with a 650 BG Demon (similar to a Holley 750) and it works pretty good. A little rich at cruise, but I'm slowly getting it tuned in.
Also, if its an older ZZ4, I'd recommend putting a new mech. advance curve kit and an adjustable vacuum advance canister in the HEI distributer. It did wonders for my engine.
I ended up with a 650 BG Demon (similar to a Holley 750) and it works pretty good. A little rich at cruise, but I'm slowly getting it tuned in.
Also, if its an older ZZ4, I'd recommend putting a new mech. advance curve kit and an adjustable vacuum advance canister in the HEI distributer. It did wonders for my engine.
Race Director
Joined: Oct 2000
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From: central FL, near the beach.
Safety Car
Joined: Apr 2001
Posts: 3,581
Likes: 28
From: Spring, Texas
I just put a Holley Street Avenger 670 on my ZZ4 (in a 69 Camaro) and it runs really well. Chose a Holley largely because I know them and how to work on them (though not an expert). Found it for sale used locally ($125 for a $400 carb that was only run for an hour). 
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Thread Starter
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
Thanks.
Thread Starter
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
Drifting
Joined: Jun 2005
Posts: 1,725
Likes: 0
From: Hanover Maryland
These are the AN fuel lines and fittings. This is all I used in my Resto-Mod 82 from the tank to the carb.
http://www.jegs.com/webapp/wcs/store...58351_-1_10019
http://www.jegs.com/webapp/wcs/store...58351_-1_10019
Thread Starter
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
These are the AN fuel lines and fittings. This is all I used in my Resto-Mod 82 from the tank to the carb.
http://www.jegs.com/webapp/wcs/store...58351_-1_10019
http://www.jegs.com/webapp/wcs/store...58351_-1_10019
Cruising
Joined: May 2007
Posts: 13
Likes: 0
Carburetor for ZZ4
I also just ordered a ZZ4 for my 77 with auto trans. I think I am going with the Victor series water pump but my big question is still which carb to go with ,, it seems everyone I talk to has a different opinion ( of course) One carburetor that was brought to my attention is the quick fuel ss 680-vs. I am not a gear head enough to make a comfortable decision and would like opinions for which carburetor would be the one to go with. I see that the BG demon 650 could also be a possibility. Any advice would be of help, also looking at putting on a set of shorty style headers if it would help?
Thanks,
Lenny
Thanks,
Lenny
Last edited by Leno; Sep 2, 2007 at 01:48 PM. Reason: add info
Melting Slicks
Joined: Mar 2006
Posts: 3,342
Likes: 7
From: Connecticut
What intake did the ZZ come with? Is it a dual pattern for square and spread bore carb?
I bought a long block so I'm using my Edelbrock intake with a QJet.
I also bought the Edelbrock Victor series water pump to avoid any problems which seem to be very common with the ZZ and stock pump.
I bought a long block so I'm using my Edelbrock intake with a QJet.
I also bought the Edelbrock Victor series water pump to avoid any problems which seem to be very common with the ZZ and stock pump.
Thread Starter
Safety Car
Joined: Oct 2006
Posts: 3,993
Likes: 9
From: Gig Harbor WA
Thanks.
Safety Car
Joined: Nov 2004
Posts: 4,359
Likes: 57
From: Mundelein Illinois
Had an Edelbrock 750 with electric choke and vacuum secondaries. switch to Holley 750 with electric ckoke and vac sec. changed the secondary spring to yellow and adjusted per lars instructions. Set timming and set dist per lars and man what a difference. A lot more power with the same mpg. Now we need to get to the dyno
GM Fast burn with hot cam
GM Fast burn with hot cam