TBI to CARBURETOR change

78Delta88

Master Mechanic
Supporting Member
May 23, 2022
406
43
SW Arizona
Finally the carburetor to arrive today. Originally ordered July some time.

So next week I'll start the TBI to Carburetor conversion.

Will try to do everything by the numbers as much as possible and take good photos through out.

Hopefully can show how to make a proper wire loom and fuel system, and then setup and final tune.

Everything getting changed. Fuel system, new wire loom, new HEI etc...

Base vehicle is 91 Caprice, 305 Roller Cam TBI V8, 700R4 (3 Speed +1 Overdrive) Auto Transmission.

Not sure of current rear gears. But probably will change to 3.73 or 3.55 Posi.
 

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stew86MCSS396

Apprentice
Aug 1, 2022
94
33
(808)
Assuming you're swapping the TBI intake for ??? Not sure what needs to be done but seem to have read that there's an issue with the distributor hole on these b-bodies. I'm sure it's as simple as enlarging it to the same size as the TBI one. If you don't then there may be issues installing the distributor. 🤷‍♂️

Might benefit from a cam change instead of running that puny peanut cam, too.
 

tkruger

Master Mechanic
May 6, 2015
347
63
NY
Why are you going from the TBI to a carb and not just upgrading the fuel injection system? I have the original TBI on my 4.3 Monte Carlo. It has been fully reliable. 130k and I do not think it has needed repair yet.

Not critising, just wondering what you plan to gain using the carb verses fuel injection. I have seen more people going from carbs to EFI.
 

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