ciffer
1/2 ton status
What would I need to do to convert my TBI suburban to a carb?
I have an intake and a stack of Q-Jets.
I have an intake and a stack of Q-Jets.
CK5
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converting TBI to Q-Jet
- Thread starter ciffer
- Start date
dirtygoat
1/2 ton status
Why???
ciffer
1/2 ton status
To make modifications easier and increase cam selections in the motor i am building.
I don't have my heart set on switching to carbed, I am just wondering what all is involved besides the obvious: carb, intake, fuel line, fuel pump, et cetera.
I don't have my heart set on switching to carbed, I am just wondering what all is involved besides the obvious: carb, intake, fuel line, fuel pump, et cetera.
lectric80
3/4 ton status
Carb, intake, fuel line, fuel pressure regulator, and possibly a different ignition module in the distributor. If there is anything I missed I am sure others will chime in. You should be able to use the in-tank pump as long as you reduce the pressure with the regulator so it doesn't flood out.
Stick with the TBI. It'll take mild cams with relative ease. Check out the prom burning section at www.thirdgen.org . Lot's of info on making a TBI/TPI run with big cams. 
As for switching, if you must, you'll have to use the electric fuel pump because TBI motors are not equipped with a fuel pump mounting boss. Get a bypass style fuel pressure regulator. You'll have to have a special intake that will work with the vertical center intake bolts. Most aftermarket companies make one that will do the job. Make sure you use a dual plane intake so you maintain your bottom end torque. A HEI distributor will also be needed since you are doing away with computer controls.
As for switching, if you must, you'll have to use the electric fuel pump because TBI motors are not equipped with a fuel pump mounting boss. Get a bypass style fuel pressure regulator. You'll have to have a special intake that will work with the vertical center intake bolts. Most aftermarket companies make one that will do the job. Make sure you use a dual plane intake so you maintain your bottom end torque. A HEI distributor will also be needed since you are doing away with computer controls.
ciffer
1/2 ton status
Stick with the TBI. It'll take mild cams with relative ease. Check out the prom burning section at www.thirdgen.org . Lot's of info on making a TBI/TPI run with big cams.
As for switching, if you must, you'll have to use the electric fuel pump because TBI motors are not equipped with a fuel pump mounting boss. Get a bypass style fuel pressure regulator. You'll have to have a special intake that will work with the vertical center intake bolts. Most aftermarket companies make one that will do the job. Make sure you use a dual plane intake so you maintain your bottom end torque. A HEI distributor will also be needed since you are doing away with computer controls.
I have a performer (dual plane, of course) intake with the non-vertical bolt holes, a mechanical pump, a point-type distributor, a stack of roch quads (80s style) and mechanical all-roller cam and valvetrain. it is sounding like more money than it is worth to switch my current TBI endigne; i guess all of the will have to wait for the new engine to be finished, which is a 70s 350 casting. i guess the only thing will need is a different gas tank and gas lines.
Stick with the stock tank and pump and run the bypass regulator. More stable fuel pressures and since fuel is constantly flowing by the regulator back to the tank, your fuel will be cooler and less prone to boiling when sitting.
