Thread: Chevy Truck World

OH, there is also a 515 carbed LS3 crate motor available. makes more power than an LS7 and half the price

I want to rebuild an older carb motor i have to put in my 91 blazer and was wondering what all has to be changed. I`m not real familiar with tbi systems so any advice would be greatly appreciated.Thanks

I just did what you want to do...And it can be done, your going to need an adapter bracket if you want to keep your cruise control @ Overdrive., Also you might not be able to use the same hoses for your heater, as the holes in the intake may be different, and sensors will have to mount in different places.. Other then that its a pretty straight forward swap, your not using a computer anymore so Com. Tuning isnt an issue.

Put your TBI and intake on that motor and most everything esle will work out. If you have all of your accessory brackets from your old engine and mount them all on the other engine. The block and probably the heads of the TBI and a Carb motor should be the same. I worked around a computer doing the same swap before and really didn`t like it. It is best to use your computer to run the engine. It will be more efficient. The timing also won`t...

You will also need to change your fuel pump. Carb engines generally have the fuel pump on the engine and its powered by the cam shaft. TBI/TPI have the fuel pump in the fuel tank and push more fuel than your carb can handle. your better off swapping the intake manifold and all the engine sensors keeping teh TBI set up. I swapped in a `85 4.3L engine carb engine into my `93. Swapped the sensors, and intake manifolds. I did have to drill one...

1st of all, WHY do u wanna do this swap??? i did it to my 90 k5 and if i had it do over again, i wouldve kept it tbi...u will need a fuel regulator, a new distributor, a carb & a new intake...thats all i did to my k5 and it ran jus fine...