Pontiac GTO 1964–1967 car dimensions: 5243 mm long, 1890 mm wide and 1372 mm high. Unladen weight is 1,565 kg. Boot space with the seats up is 909 litres.
The cabin features standard front bucket seats in Morrokide vinyl with nylon-blend carpeting and simulated engine-turned aluminum dash inserts. A Hurst floor shifter is standard with the three-speed manual. Optional items include a custom air conditioner, power windows, power tilt driver's seat, seven-position tilting steering wheel, padded dash, center console, radios with speakers, and a custom sports steering wheel. No electronic driver aids are present.
Trunk capacity measures 32.1 cubic feet.
Heavy-duty suspension with stiffer springs, shocks, and larger stabilizer bar is standard. A heavy-duty radiator is available as an option.
Front bucket seats in Morrokide vinyl are standard, color-matched to nylon-blend carpet. Engine-turned aluminum dash inserts come standard. A center console, seven-position tilt steering wheel, power windows, power tilt or six-way driver's seat, custom air conditioner, tinted glass, and padded dash are optional. The firm suspension favors road control over a soft ride.
High-compression 10.75:1 engines need 100-octane fuel to prevent detonation.
Oil and filter changes every 60 days or 6,000 miles.
Chassis lube lasts 30,000 miles or one year with special grease.
Front seat belts optional early. standard from January 1964 with factory fittings.
9.5-inch four-wheel drums standard. power assist optional. Dual-circuit system and optional front discs for 1967.
Padded dash optional. energy-absorbing column and padded panel standard in 1967.
The 389 or 400 V8 engines run 10.75:1 compression. Use fuel of at least 100 octane for Tri-Power and high-output versions. Lower octane causes spark knock and possible engine damage.
Change engine oil every 60 days, never exceeding 6,000 miles. Replace the oil filter on the same schedule. Tri-Power fuel filters need yearly or 12,000-mile service. Chassis points hold special grease for 30,000 miles or one year under normal use.
Standard brakes are self-adjusting 9.5-inch drums with optional power assist and metallic linings for heavy duty. Seat belts for front outboard positions became standard mid-1964. rear belts optional. 1967 models add dual master cylinder, energy-absorbing steering column, padded instrument panel, non-protruding knobs, and four-way flashers as standard. Front disc brakes optional that year.
Break in with moderate speeds under 50-70 mph for the first 600 miles and avoid hard stops early. The heavy-duty suspension gives firm control suited to open roads. Optional air conditioning, power steering, and power brakes ease daily driving. Reproduction interior and mechanical parts remain widely available.
Length 5243 mm, Width 1890 mm, Height 1372 mm, Wheelbase 2921 mm (GTO 1964–1967)
Sources: manufacturer data, 1964 Pontiac GTO brochure via carbackcatalogue, Wikipedia/conceptcarz.com, hotrod.com 1965 article.