Background
Released new in 1966, the Jaguar 420 - and its badge-engineered brother the Daimler Sovereign - was based upon the chassis of the 1963 Jaguar S-Type, and was intended to portray the ‘ultimate sports saloon’ in Jaguar’s expansive lineup, along with attempting to revive sales figures which were dwindling due to the unusual styling of the S-type.
Powered by a 4.2-litre, twin-carburettor inline-six XK engine producing a claimed 245bhp from the factory, the intention was for this new saloon to blend sporting prowess with a luxurious interior and excellent ride quality, in order to broaden the appeal of the 420 as much as possible. Of particular note is the suspension setup, which retained the independant rear axle seen in the S-Type.
In addition to retaining the independant suspension of the S-Type, the 420 also benefitted from optional Marles Varamatic power steering, which afforded a variable steering ratio. This meant that the steering was light and relaxed while pointing almost dead-ahead, becoming stiffer and affording more feedback as the wheel progressed towards full-lock, with the idea of allowing relaxed driving in everyday situations, but affording the driver plenty of feedback and ‘feel’ when in a more performance-focused scenario.
All of this work paid off for Jaguar, with the motoring press lavishing the 420 with praise. Motor magazine stated that the 420 had “a combination of speed, comfort and safety is as good as any in the world, regardless of cost” while Wheels magazine in Australia summed up the 420 by saying “While [Jaguar] can continue to build and sell cars as good as this, there is hope for the man who cares about his motoring.”






