Ford 302 V8 (1968 Shelby GT350)

The 1968 GT350 engine

Ford’s 302-cubic-inch V8 powered the 1968-model-year Shelby GT350. The period sales brochure describes an overhead-valve engine with hydraulic valve lifters, four-barrel carburetion and availability in both fastback and convertible GT350s. This record concerns that specific application, rather than every Ford engine sharing the 302 displacement. Period Shelby brochure.

Within the GT350 engine catalogue, it follows the Shelby-modified 289 High Performance V8 (1965–1967). Its history requires distinguishing the equipment promoted in sales literature from the components actually installed and later changed through dealer service.

Engineering and transmission-specific equipment

The sales brochure promoted a Cobra intake manifold and four-barrel carburetor. Surviving engine documentation shows a more varied production specification: Ford iron intake manifolds and Autolite carburetors were also original equipment. Consequently, an aluminum intake alone does not establish how a particular car left the assembly line. Intake documentation.

Ford identified the four-speed engine assembly as 283J 01. It had a flywheel, its own carburetor and distributor specification, and Thermactor emissions equipment with provision for air-injection tubes in the cylinder heads. The documented original Autolite carburetor is C8ZF-9510-C. Four-speed engine documentation.

The automatic-transmission assembly was 284J 01, with a flexplate and different carburetor and distributor equipment. It used Ford’s IMCO emissions configuration without the four-speed engine’s Thermactor air-injection system; the documented Autolite carburetor is C8ZF-9510-D. These are transmission-related configurations, not separate engine displacements or evidence of a distinct export-market engine. Automatic engine documentation.

Intake revisions during 1968

The Coral Snake’s documentary account identifies a Shelby recall letter dated 21 May 1968 concerning the cast-iron intake. Its application chart distinguishes cars built before 15 March 1968 from later-built and recalled cars. Aluminum-intake combinations could retain an approved Autolite carburetor or use the applicable Holley unit, depending on configuration. The account also cautions that some owners may never have returned their cars for the replacement. Recall and application chart.

An original iron-intake car and a car carrying an aluminum Cobra intake can therefore represent different stages of the same engine application. Build documentation and service history matter when interpreting surviving examples; a single advertised specification cannot describe every car’s equipment throughout its life.

Production context and dating

The vehicles began on Ford’s assembly line at Metuchen, New Jersey, before the partially completed Mustangs travelled to Ionia, Michigan, for Shelby conversion by A. O. Smith. These locations describe vehicle assembly and conversion; they do not establish the casting or manufacturing location of an individual engine. Production-location history.

The designation 1968 refers to the vehicle’s model year. Engine casting, engine assembly, vehicle assembly and subsequent dealer work have separate dates. The documented four-speed example includes an August 1967 block casting and engine assembly date, illustrating why a preceding-calendar-year date need not contradict a 1968-model-year application. Engine date markings.

Identification and historical significance

The documented engines use a C8OE-6015-A block casting, with a casting date, a separate engine assembly date and a serial-number stamping. These markings should be interpreted together with vehicle records. Shelby conversion removed the original stamped-steel valve covers, so the paper identification label originally attached to a cover may no longer survive. Automatic engine identification.

The 1968 GT350 engine is historically useful as a record of how Ford engine assemblies, Shelby-specific presentation and dealer revisions intersected. Its transmission-specific emissions equipment and changing induction arrangements are central to understanding the application and preserving the distinctions between original production equipment and later alterations.

Sources

• 1968 Shelby Cobra GT350/GT500 sales brochure — period advertising and general engine description.
• The Coral Snake: GT350 four-speed engine — assembly identification, Thermactor equipment and dated components.
• The Coral Snake: GT350 automatic engine — assembly identification, IMCO equipment and original components.
• The Coral Snake: Air Cleaners, Carbs and Intakes — intake recall chronology and application chart.
• The Coral Snake: Shelby — Here’s Where They Were Built — Metuchen and Ionia production context.