2.8 Intake manifold, injectors, throttle body and ECM can all be used to get the rig back on the road as quickly and easily as possible

From what I've read it is advised to step up to 4.3 injectors, since they are larger they will be better matched for the fuel requirements of the new block. Don't forget though, that injector size doesn't change how much gas is delivered since all of that is regulated by the computer. To better understand it, you want to match the range of fluid flow of your injectors to the fuel requirements of the engine.

You can opt to bore your intake manifold to 1 11/16" and use a matching throttle body from a 4.3L chevy. This will just give you better top end performance and throttle response but is not required. I made a step by step writeup you can find by searching under "4.3" and my username.


Don't change your ECM. When the power is removed from it for a while then reconnected, some of the variables specific to your engine will be re-set and this will include the slight increase in displacement.