Jaguar XKE 4.2L Inline 6 1966 images

The 1966 Jaguar E-Type’s biggest upgrade wasn’t more horsepower, it was everything Jaguar fixed around the engine. A larger 4.2-liter inline six gained real mid-range torque, a fully synchronized gearbox erased the old car’s notoriously balky first gear, and a modernized electrical system made the E-Type as usable as it was beautiful. These photos, courtesy of Gateway Classic Cars, showcase a Series 1 example from the era widely considered the E-Type’s mechanical sweet spot.

1966 Jaguar XKE 4.2L Inline 6 Cyl 4-Speed Manual

MCF thanks Gateway Classic Cars for the images displayed here.

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A car that could out-corner nearly everything on American roads in 1966 didn’t need a big-inch V8 to prove a point; it just needed the right engine tucked under that impossibly long hood. Jaguar had already stunned the world with the E-Type’s styling, so the harder trick was making the driving experience live up to the looks. In 1965 the company reached for a bigger, torquier inline six and quietly rewrote what the car could do without touching its silhouette. What changed under the skin, and why did it matter more than the numbers on paper suggested?

The Quiet Upgrade Under the Hood

In 1965, Jaguar bored out the E-Type’s inline six from 3.8 liters to 4.2 liters, and the changes went well beyond displacement. The car pictured here, a 1966 example finished in the Series 1 4.2-liter specification, represents that fully sorted version of the E-Type, one that traded a few of the original’s rough edges for real-world usability without losing any of the drama.

Why 283 lb-ft Mattered More Than the Peak Number

On paper the 4.2-liter six made about the same peak horsepower as the earlier 3.8, roughly 265 hp at 5,400 rpm, so the headline number barely moved. The real gain was torque, which jumped about 10 percent to 283 lb-ft, giving the E-Type noticeably stronger mid-range pull exactly where most drivers actually live on the road.

Small Fixes That Made a Big Difference to Drive

Jaguar also gave the 4.2-liter cars a fully synchronized four-speed gearbox, finally curing the notoriously balky, unsynchronized first gear that had frustrated owners of earlier 3.8-liter E-Types. Reclining seats, an upgraded electrical system with an alternator replacing the old dynamo, and a more reliable brake package rounded out a car that felt genuinely modern rather than merely fast.

The Series 1 Sweet Spot

These 1965-1967 Series 1 4.2 cars are often considered the sweet spot of the entire E-Type run: still wearing the purest, least cluttered version of Malcolm Sayer’s original bodywork, but with enough mechanical maturity to actually live with day to day.

A Gateway Classic Cars Survivor

A well-kept example like the one shown here, sourced through Gateway Classic Cars, is a reminder of just how far ahead of its time the E-Type’s combination of shape and engineering really was.

Why the E-Type Still Defines the Species

Enzo Ferrari’s supposed comment calling the E-Type the most beautiful car ever made has become such a cliche that it obscures how genuinely radical the shape looked next to anything else on sale in 1966. Six decades later, Series 1 4.2 cars like this one remain the benchmark against which every subsequent E-Type, and arguably every subsequent Jaguar, still gets measured.

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