The S Type Jaguar was built from 1963-68, it was based on the Mk II, but a bit more sophisticated, offering buyers a more luxurious alternative to the Mark 2 but without the size and expense of the Mark X. It also got independent rear suspension and featured longer rear bodywork, among other styling and interior changes. The S-Type was available with either 3.4 or 3.8-litre XK engines but only in twin carburettor form because the triple carburettor setup would not fit into what was essentially still the Mark 2 engine bay. The S-Type sold alongside the Mark 2, as well as the Jaguar 420 following its release in 1966