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Can a 1974 5.9L 360 Chrysler engine fit into 1995 Dodge Ram 1500 that originally had 3.9L engine?

No, a 1974 5.9L Chrysler 360 will not easily fit into a 1995 Dodge Ram 1500 that originally had a 3.9L engine. While both are V8s, there are significant differences that create major incompatibility issues:

* Engine Mounts: The 1974 360 will have completely different engine mount locations than the 1995 Ram's 3.9L or even later 5.9L engines. You'd need entirely custom engine mounts fabricated.

* Transmission: The 1974 engine likely used a different transmission than the 1995 Ram. Adapting the transmission and bellhousing would be a very complex task, potentially requiring custom fabrication.

* Computer Control: The 1974 360 is a carburetor engine with no electronic controls, whereas the 1995 Ram uses a computer-controlled fuel injection system. Wiring harnesses, sensors, and the entire control system would need significant modification or replacement, likely requiring a stand-alone aftermarket engine management system.

* Exhaust System: The exhaust manifolds and system will not match. A completely custom exhaust system would be required.

* Accessory Drive: The accessory drive (alternator, power steering pump, etc.) will be different and incompatible.

* Size and Weight: While both are V8s, the 1974 engine's dimensions and weight may be different enough to create clearance issues with the frame, body, or other components.

In short, while it's *theoretically* possible with extensive custom fabrication and engineering, it's not practical. The cost and difficulty would far exceed the value of using the older engine. Swapping in a later-model 5.9L Magnum engine (from roughly 1994-2003) would be a far simpler and more feasible undertaking.