Can a V8 fit in 1986 Chevy Monte Carlo ls?

No, a standard V8 engine will not easily fit into a 1986 Chevy Monte Carlo LS without significant modifications. The 1986 Monte Carlo LS typically came with a smaller V6 or a smaller V8 (like the 305 cubic inch). While you *could* potentially fit a larger V8, it would require substantial fabrication and modification, including:

* Engine bay modifications: You'd likely need to cut and modify the firewall, possibly the inner fenders, and potentially even the radiator support to make room for the larger engine.

* Transmission and driveshaft: You'd need a transmission and driveshaft compatible with the larger V8, which probably won't be a direct bolt-on from the original setup.

* Exhaust system: The exhaust system would need to be custom-fabricated.

* Wiring harness: The engine's wiring harness would likely need modification or replacement to integrate with the car's existing electrical system.

* Cooling system: The cooling system might need upgrades to handle the increased heat generated by the larger engine.

* Suspension modifications: A larger, heavier engine might necessitate adjustments to the suspension to handle the extra weight.

In short, while not impossible, it's a very involved and expensive project requiring significant mechanical expertise and fabrication skills. It's far from a simple swap.