350-Powered 1973 Jaguar XJ6 Sedan

Description

Introduced in 1968, the XJ6 was the flagship model of Jaguar’s new XJ series, designed under the direction of Sir William Lyons. By 1973, the XJ6 had matured into a highly regarded Series 1 saloon, powered by a smooth 4.2-liter inline-six engine derived from Jaguar’s legendary XK series.

The car featured independent rear suspension, disc brakes on all four wheels, and a sophisticated ride quality that rivaled much more expensive European sedans. Its elegant styling, with a long bonnet, low stance, and brightwork accents, made it instantly recognizable. Inside, the XJ6 offered wood veneer trim, leather upholstery, and a quiet, comfortable cabin—hallmarks of British luxury.

The 1973 model marked the final full production year of the Series 1 before Jaguar transitioned to the Series 2, which in 1974 introduced design changes to meet evolving safety and emissions standards, especially in the U.S. market. Today, the 1973 XJ6 is celebrated by enthusiasts for its classic styling, smooth performance, and its role in establishing Jaguar as a serious contender in the luxury sedan market.

Beneath the bespoke British tailoring of this unassuming 1973 Jaguar XJ6 Sedan — finished in Greensand over Cinnamon leather — beats the heart of an American powerhouse. While it retains the classic blend of athleticism and luxury that defines the XJ6, under its long reverse-hinged bonnet lies a Chevrolet small block 350 V8 mated to a Turbo 350 three-speed automatic transmission. The seller notes the swap was intended to simplify servicing and reduce running costs. Otherwise, this dapper Jag remains largely original, with correct trim and components throughout. It’s a gentleman’s Savile Row cut suit concealing a Detroit brawler beneath the lapels!

Highlights

• Powered by a Chevrolet small-block 350 cu-in V8 paired with a Turbo 350 (TH350) three-speed automatic transmission

• Finished in Greensand paint over Cinnamon leather upholstery

• Summit Racing four-barrel SUM-RM08600VS carburetor

• Holley carburetor, air cleaner, and head covers

• The chassis number (UDIL75306) decodes as:

  • U – U.S. spec

  • D – Jaguar XJ6 Series 1

  • I – 4.2-liter V8

  • L – Saloon/sedan model

  • 75306 – Serial number

Features

• Original chrome wheels wrapped in BFGoodrich Radial T/A P235/60R15 tires

• Nardi wood-rimmed steering wheel with Jaguar horn button

• Yellow vinyl headlight film on highbeams (removable)

• Original British-Leyland AM/FM radio and speakers

• Original clock

Known Imperfections

• Speedometer, tachometer, and oil pressure gauges work but are not connected:

  • Needs adapter to attach oil pressure gauge (currently has operable gauge under hood)

  • Needs worm gear in transmission for tachometer

  • Needs GPS converter for speedo or other solution

• Some small paint imperfections and touch-ups spots

• Headliner has a some bubbling (photographed)

• Original AM/FM radio does not work

• Air conditioning does not work

Included

• Hayne's Jaguar XJ6 (1968-1986) Automotive Repair Manual

• Air conditioning system components and new compressor

• Super Tuning and Modifying Holley Carburetors

• Original steering wheel

• Spare tire and tool bag

• Additional spare parts

• Carburetor rebuild kit

• CocoMats floor mats

• Original exhaust tips

• Overrider hoops

• Parts catalog

Ownership History

The Indiana seller of this 1973 Jaguar XJ6 has owned it since March 2017. The seller notes, “The car spent its life in the Phoenix area until I purchased it — as far as I know, it's always been garage kept and only used in good weather. The original owner replaced the inline-six with a Chevy small-block 350 V8 and 350 Turbo transmission, and it runs great — no oil leaks and never need to add oil between changes. However, the transmission has started to leak but works perfectly.”

The yellow headlamp lens covers have been removed from the low beams, the original brake master reservoir is included but has been replaced on the vehicle (photos of reservoir in gallery are outdated), and the overriders have been removed but are included.