* 1994 Thunderbird: Used the older Windsor 4.6L V8 (also known as the 5.0L in some applications). This was a pushrod design.
* 1995 Thunderbird: Switched to the new Modular 4.6L V8. This was an overhead cam (OHC) design. While both are 4.6L, the Modular engine was significantly different in its architecture, leading to improvements in performance, efficiency, and refinement. The Modular engine also had different bolt patterns and other components which made it incompatible with the older Windsor engine.
Therefore, the change wasn't just a minor tweak; it was a complete overhaul of the engine design. Expect significant differences in parts compatibility, performance characteristics (power output, torque curve, fuel efficiency), and maintenance requirements between the two years.
