intakes
 

i havetwo 4.3s onewith throttle body and another with cpi can i swap the intakes from motor to motor and will it work?

RE: intakes
 

If you are talking about the intake manifold itself (what mounts to the cylinder heads)... They should physically bolt up, but the fuel systems and engine controls are quite a bit different between the two models. A TBI vehicle runs off of a low pressure fuel system (8-10psi) while a CPI vehicle runs off of a high pressure fuel system (50-60psi). Not only would you need to swap out the computer, wiring harnesses, etc, but you would also have to swap the fuel pump and the fuel lines themselves.

RE: intakes
 

yeah the manifold sorry for the confusion. i have a 93blazer that has a blown cpi motor. i have a spare motor with tbithat runs i was going to put the good motor in and take the cpi off the blown motor and put it the the good one with the tbi this will work am i correct?? i appreciate the help

RE: intakes
 

Yes, it should work. There were various changes in the block through the years. Check out THIS ARTICLE which details these changes.

RE: intakes
 

THANKS FOR THE HELP MAN BY THE WAY ANY IDEA HOW MUCH TO CHIP THE COMPUTER?

RE: intakes
 

It'll work.
I put a '85 carb motor that had a TBI unit on it into a '93 with a CPI unit.
http://chevytruckworld.tenmagazines....mp;album=18998

A few pics of the process.
NOTE: the '85 4.3 came from a full size truck and has a two piece rear main seal. Since the 4.3 with a two piece rear main seal was never offered in a S10, let alone a 4x4 S10 the factory never made a oil pan for my situation. I had to fab one up myself. you wont have the oil pan problem. I added the note so you dont get confused and stress ofver the oil pan issue I ran into.