Carb Help
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Joined: Jul 2001
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Carb Help
Hi everyone, I am looking for a little bit of help here. I recently bought a offie intake and Holly 4160 carb off ebay. This is going on an '84 F-150 300 I6. Everything is stock, exhaust is simply a strait pipe with a single glasspack. My problem is that this carb is a 600 cfm unit, and I have been told that this is way too big for the 300. I am "stuck" with this carb so I am going to make it work. I have come to realize that I am most likely going to need re-jet, change the power vavle ( to a 2 stage) and increase the strenght of the secondary springs. I need to do this inexpensivly though, i do not have the money to buy a wide range of power valves and jets to see which works the best. I am looking for any advice on what sizes of jets, power vaves or sprong tensions I would most likely need. I know this is asking specialized information for MY vehicle, but, if any one out there can give me a jumping off point, or any other information on how to adapt this carb to my application, I would really appreciate it. Thank you! And, feel free to email me.
Eric
Oh, truck is stick, stock cam, power brakes (if that affects vacuum)
Eric
Oh, truck is stick, stock cam, power brakes (if that affects vacuum)
Cargo Master
Joined: Oct 2004
Posts: 2,148
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From: Seneca, SC
so I hope you still have the truck and figured this out, but I figured that I'd give you an answer anyway. I'd find a way to get the linkage to not run the secondaries at all. I ran a few carters at 625CFM with my setup both before and after the performance upgrades, and I gotta tell you that as a 2 barrel the carb works pretty good. It will fall on it's face a bit above 3500 RPM like this, but it won't run dangerously lean, and it really shouldn't be above 3500 that much anyway. Other than that I can't really help ya. I ended up going with a truck avenger 470 as my final choice, and am in the middle of wide band O2 tuning it.
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