The preceding Jaguar S-Type’s styling had been unchanged since 1959 and as a result, much of the public lost interest in the car’s yester-year styling. When Jaguar greenlit the 420, they knew everything had to be changed in order to recapture the public’s interest. Happy with parts of their original design, Jaguar left the rear of the 420 exactly the same as it appeared on the S-Type. However, the front of the car was heavily redesigned in order to fit in with more current design trends. The interior remained largely the same, and most of the elements that were adjusted were done with a heavier focus on cabin safety. One of the most reworked areas of the 420 when moving on from the S-Type was the straight-six engine. Refinements include the following: a stronger transmission, a more efficient crossflow radiator, a dual-line hydraulic braking system, twin 2-inch HD8 SU carburetors were added, new brake discs, a Holset engine cooling fan, negative earthing, a pre-engaged starter, and an alternator. All the adjustments made to the 420 were highly approved, and contemporary articles on the car were quite impressed by what Jaguar had managed to put together. “For a reasonable basic price of $5900, Jaguar offers brisk performance, outstanding braking, excellent handling and ride, quality finish, and luxury in abundance, all in an automobile that's easy to maneuver in today's maddening traffic.” Road & Track US, 1967. We sincerely hope the author is coping well with 2022 traffic.