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4 barrel carb tricks

2980 Views 5 Replies 5 Participants Last post by  z50k2
What is the key to making an Edelbrock 4 barrel carb work well off-road. I have a 600 cfm carb (1405), and when I am on steep inclines, at slow speeds, or stops, like when rockcrawling, the carb floods out. I have installed the "offroad kit" (spring loaded needles and seats). Has anyone had luck running this carb when rockcrawling? Right now it is on a 304, but soon will be on a 360. I imagine this will help a little, but are there any other ways to fix the flooding problem.

I was going to go with holley pro-jection (TBI) and just be done with the carb problems, but I figure I will try and give the carb. one last shot. Any and all help is greatly appreciated. Thanks


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If you haven't figured it out yet the measurements for float setting that they give you with the off-road needle kit is WRONG WRONG REALLY WRONG. Call them and they may tell you themselves. You have to play with the floats to get it correct.

The carb will also flood out on steep inclines (or under really hard acceleration) because the float bowl vents are really low on a carter AFB/Edelbrock carb. Under these circumstances fuel from the float bowl will wash into the venturi. I dont know if there are extentions available for them, but it is something to check.

Mike H.
1983 CJ-7 Laredo
1999 Dakota 4x4
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If you can afford the fuel injection, by all means it is a superior way to get fuel to the cylinders. I'm running the edelbrock 600 and it's true that the stock float recommendations for the off-road kit are wrong. I've had good luck running the float level at around 7/16 with the drop right at 1 1/4. Coupled with a fuel regulator (that you can pick up at Autozone/Napa for about 15 bucks) set at around 1 or 2 lbs when off-road. Also, the lower overall gearing you have the better. It allows you to run at a higher rpm without actually going anywhere. I incorporated a bike shifter for this with both a gear shifter and a brake lever. This way I can punch up the rpm by a couple hundred with the gear shifter and still use the lever for some quick throttle.

Nuke the unborn gay whales for Jesus
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Here is some info I got off the old board....

Im running an Edelb. 600 cfm on my 304. I've had good success with the off-road kit installed, leaned out to .098 main/073 x 052 rod and two stages lean in the secondaries (.089). I also installed a fuel regulator that I run between 2 and 5 psi. This same setup worked well for a friends Scout 345 cid. If you're still having problems try swapping step-up springs. A free flow air filter also helps.

'79 CJ-7
I just got an e-mail from Holley.They suggested 4 1/2 to 5 psi on the fuel pressure. I forgot to ask if you can regulate a mechanical pump or just an electric pump.Does anyone know this? Thanks

1979 CJ-7 401 T18
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