I need to replace the carburetor on my 75 cj5 304 mild cam, headers, edelbrock performer intake. Question is what size to put on and what brand. Not wanting to put on sniper efi yet, mostly drive streets and trails so carburetor should work. Would appreciate any information and experience. Thanks for your help.
But then, What did it have on it and why are you replacing it? Did it go bad or do you want to change it because of the other mods you made? Would be nice to have some more info.
Not sure what it originally had a holly 650 maybe always ran rich, flood out on hills also had a edelbrock torker on it. Had a guy work on it put a fast fuel carburetor on it, didn't get bugs worked out had to park it for 5 years. Now back to bring it back to life. Replaced intake with a performer, carburetor cleaned lots of other new parts, distributor. Can't identify the fast fuel carburetor the guy who put it on I find out is a flake. Want to start over with the carburetor, I've put so much money into it efi is a lot of money right now. Pulling the tub to replace floor pans. Thanks again for your knowledge.
The answer is, A 600 cfm vacuum secondary Holley carburetor works perfectly well on this. I have had one on a 3.9 litre mopar v6 for 25 years.
But my friend has a Holley 600 on his 304 and he had issues with it not being able to adjust floats or air screws and be consistent along with flooding on hills. So he put a fuel pressure regulator on and that cured it. Dropped from 6psi from fuel pump to 3.
In addition, Some "expert" recommended a 470 cfm for a 5 litre, WOW! This is why nobody should ask, let alone take, advice here! It's easy to find a chart (online or a carb box) which would tell which size you need. To maybe use a 470 that 5L would have to scream RPMs off the chart. I ran 650 on a big block 429 (thought I needed bigger because hey, I was noobie dork decades ago too) but the chart specified it so I bought it and it ran great! You'd likely had done well with the stock motorcraft 2bbl, Very easy to use carb with good performance, and well respected. Remember when it comes to 4bbl you aren't getting into the secondaries unless you are standing on it, also AMC exhaust manifolds are free flowing, maintenance free, and indestructible AND you'll never notice anything from headers unless the engine is screaming. Save your money, most of these clowns are bolting together peaky street cars but will oh and aw over a diesel conversion.
The 470 is plenty cfm for the amc 304 and the fords 302. If you feel it’s also a good idea to contact Holley directly. I used the 470 on a 304 and was very satisfied. Now I’m running the 670 on a amc 360. Many over carb, but to each their own. I was trying to be helpful and provide some of my insight. Seems others have chimes in and thought the 470 was a good choice as well.
Yes, a carb in the 470 even up to 500 range is perfect. The majority of people stated "over carb" and drown engines insisting on 750s etc.
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