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Will TBI system off a Chevy 305 work on 350 for 1987 Silverado 4x4?

No, a TBI system from a 1987 Chevy 305 will likely not work directly on a 1987 Chevy 350 without modifications. While both are TBI (Throttle Body Injection), there are differences:

* Intake Manifold: The 305 and 350 have different intake manifolds. The TBI unit is designed to match the specific intake manifold it's intended for.

* Fuel Injectors: While similar, the flow rates of the fuel injectors might be different, leading to improper fuel delivery and potential engine damage.

* Computer (ECM): The ECM is calibrated specifically for the engine displacement and other parameters. A 305 ECM will not correctly control a 350.

* Wiring Harness: The wiring harness connectors may differ slightly, and the ECM programming won't match the 350's needs.

You could potentially *modify* the system to work, but it would require significant effort and expertise, including:

* Sourcing a 350 TBI intake manifold.

* Possibly swapping injectors for those appropriate for the 350.

* Obtaining a 350 ECM and wiring harness (or reprogramming the existing one, which is significantly more complicated).

It's far easier and more reliable to simply locate a TBI system specifically designed for a 1987 Chevy 350. Trying to force a 305 system to work is prone to issues and could lead to poor performance or engine damage.

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