1964 GTO 389

Silver 1964 Pontiac GTO two-door coupe with split grille and stacked-look headlamps, front three-quarter in the GM Heritage Center hall — 1964 Pontiac Tempest LeMans GTO sports coupe in silver, GM Heritage Center collection General Motors

Silver 1964 GTO coupe seen from the rear three-quarter in the GM Heritage Center, neon signs and collection cars behind — 1964 Pontiac Tempest LeMans GTO sports coupe, rear three-quarter, GM Heritage Center collection General Motors

Engine bay of a 1964 GTO: a blue Pontiac 389 V-8 topped by three chrome air cleaners on the Tri-Power carburetors — 1964 Pontiac GTO 389 V-8 with Tri-Power triple two-barrel carburetors, GM Heritage Center collection General Motors

Red interior of a 1964 GTO with a thin-rim steering wheel, engine-turned dash panel with round gauges, bucket seats and a white shift knob — 1964 Pontiac GTO interior with red bucket seats, engine-turned dash and floor shifter, GM Heritage Center collection General Motors

Close-up of the triangular red, chrome and checkered GTO 6.5 LITRE badge on the silver front fender of a 1964 GTO — 1964 Pontiac GTO "GTO 6.5 LITRE" front-fender badge, GM Heritage Center collection General Motors

Factory statusFactory configuration

Body stylecoupe

Trim / packageGTO

Engine389 cid engine

Inductionone four-barrel

Published power325 bhp · Pontiac advertised bhp; basis not further identified

Published torque428 lb-ft · Pontiac advertised bhp torque

Forward gears3

Transmissionthree-speed manual

Matched period road testUnknown

What this record proves

The badge is only the beginning.

This is where the GTO option actually starts: a 389 with a single four-barrel, a three-speed manual, and 325 brake horsepower as Pontiac advertised it. The package was an option on a Tempest Le Mans rather than a separate model, which is the fact most later retellings quietly drop.

Pontiac published the rating without identifying the standard behind it. That missing basis travels with the number here instead of being silently converted into a modern-sounding output, because a 1964 advertised bhp figure and an SAE net figure are not the same kind of measurement and cannot be compared as though they were.

Advertised availability is not authentication. This record establishes what a buyer could order in 1964; it does not establish how any particular surviving car was built, and no matched period road test is attached to it. Those remain open until an order copy or an instrumented test is inspected.