There isn't a single horsepower figure for the 1964 Galaxie 500 XL. Depending on the engine choice, horsepower ranged from about 210 hp with the base 289 V8 to roughly 300+ hp with the 390 V8 and up to about 425 hp in the high-performance 427 V8/Interceptor packages.
Engine options and horsepower by engine
Ford offered several V8 configurations for the Galaxie 500 XL in 1964. The following figures reflect commonly cited ratings from the period, noting that the 1960s used different rating standards than today.
- 289 cubic inch V8 with a two-barrel carburetor (2V): about 210 horsepower.
- 289 cubic inch V8 with a four-barrel carburetor (4V HiPo): about 271 horsepower (gross rating; exact figures vary by test).
- 390 cubic inch V8 with a four-barrel carburetor (4V): roughly 300 horsepower, with higher-performance versions offering more torque.
- 427 cubic inch V8 (FE engine) configured for performance/interceptor packages: about 425 horsepower (gross rating), often installed on police or special-order models such as the Galaxie 500 Thunderbolt-era examples.
Notes: Engine availability and horsepower could vary by month of production and by market; the XL name itself denotes trim, not a specific engine. The horsepower figures above reflect commonly cited figures from Ford's 1964 model year documentation and period reviews.
Understanding the ratings
In the 1960s, horsepower was typically quoted using gross ratings, which measure engine output without accessories or lubrication. Modern restorers often refer to net horsepower, which is lower due to accessories. This discrepancy helps explain why numbers in period literature differ from modern expectations.
Historical context and the XL trim
The Galaxie 500 XL was a mid-to-upper trim within Ford's full-size lineup, designed to balance luxury with performance cues. While the engine options included several V8s, the exact horsepower a given car produced depended on its factory configuration, options, and any tuning for a specific market or use — such as police packages that could exceed typical consumer specs.
Summary
For a 1964 Ford Galaxie 500 XL, horsepower is engine-dependent. Buyers could choose from at least four V8 configurations, yielding a broad range from about 210 hp on the base 289 to around 300+ hp on the 390, and up to about 425 hp with the 427 Interceptor-tuned variants. The XL designation indicates trim and comfort features, not a single performance figure. When assessing a specific car, check the engine code and original build sheet for precise horsepower data.