Will a 350 V8 fit in place of 4.3 v6?

A 350 V8 (Chevrolet small-block) will *generally* not fit in the same place as a 4.3L V6 without significant modifications. While both are technically "small block" in the sense of being relatively compact compared to bigger V8s, the 350's larger dimensions, especially its wider V-shaped configuration, mean it will likely interfere with the frame, firewall, or other components in a vehicle originally designed for the smaller 4.3L V6.

The feasibility depends heavily on the *specific* vehicle. Some vehicles may have more space than others, and aftermarket parts exist to help with swaps, such as motor mounts and headers. However, expect challenges involving:

* Engine bay dimensions: The 350 is physically larger in every dimension.

* Exhaust system: You'll almost certainly need a custom exhaust system.

* Transmission: The transmission compatibility will depend on both the 350 and the original 4.3L setup. You might need a new transmission, driveshaft, and potentially other related components.

* Steering: The larger engine may interfere with steering components.

* Wiring harness: You'll need a new or adapted wiring harness to accommodate the 350.

* Cooling system: The 350 will likely require a larger radiator and potentially other cooling system upgrades.

In short: It's a major undertaking, not a simple bolt-in swap. Thorough research specific to your vehicle model and year is essential before even considering it. You'll probably need considerable mechanical skills and fabrication abilities, or access to a shop specializing in engine swaps.