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Old 04-11-2009, 06:05 AM
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tbi to carb... fuel, cam, exhaust

i am in the process of changing from tbi to carb. this is a daily driver. what is the best for the long haul, regulate the tbi fuel pump or buy an in line carb fuel pump and what psi should i have for the carb? the only set of exhaust manifolds i have, that are good, are off of a carb 305 they seem a bit small compared to the tbi manifolds. if i should not use these i will have to buy something. i think headders are to high maintance for a daily driver. should i have any concerned that the tbi cam does not match the carb? thank you in advance for all the advice, Joe. ps i welcome any solutions to all possible problems. this project started out with a "buddy" asking me "do you know any one that would want a good 1 ton truck that has been sitting for about 1 year, it just needs cleaned up and a jump start?" it has turned in to a frame off restoration. the next time i see 2 cans of either in a Florida truck i am outa here. thanks again Joe

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Old 04-14-2009, 07:41 PM
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i won't ever understand why someone would want to go from a tbi to a carb! you are supposed to go the other way. Ecspecially for a daily driver, why would you want a carb? and why are headers to high maintainence for a daily driver, and a carb is not. Are you after performance? Is the tbi junk? I don't understand this. What is wrong with the tbi manifold? If the tbi system is good i would stick with it. You are going to risk gas mileage with a carb. A tbi is an electronic carb, the computer does all of the adjusting for you. What year is this truck. Why would you put a 1 ton truck together for a daily driver? If you are looking for more performance holley makes a tbi that flows 670 cfm. That would boost it a little more. I think and will always think that a tbi to carb is the dumbest thing to do. There is many upgrades for tbi and you will never ever match a carb to efi as long as you are comparing apples to apples. Same size carb to same size tbi. Have fun man.
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Old 04-15-2009, 02:43 PM
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I recently picked up a '86 chevy van 350-350-tbi.wreck for $50.00.going to install into my project '48 dodge 4 door choptop town sedan, and have been thinking of changing to carb.if i keep tbi do i need to keep all sensors and go with cat. converter? still have all parts .still in van. don't know why i thought about a change except possible brain fade
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Old 04-15-2009, 03:09 PM
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I see no advantage- performance wise- in using a TBI. Except cold weather start-up and maybe mileage.

But yes, it needs all the sensor inputs to run right. You don't have to run a cat (prob. should, though- for the air's sake ) but you do need to keep the O2 sensor and run a computer-compatible cam.

Chips can be used in the ECM that'll allow a bigger range of mods, but you're getting into some money at that stage.

You have the where-with-all, engine-wise, to build a good carb'ed engine. This is the biggest bang for the buck, IMHO.

The tranny will need to have an external converter lock-up installed (TH350C?), but otherwise I think you got a good deal.
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