1966-1967 Ford F-Series F-100 V 4.9 300 Six (170 Hp) Automatic

The Ford F-Series F-100, specifically the variant equipped with the 4.9-liter (300 cubic inch) inline-six engine and a three-speed Cruise-O-Matic automatic transmission, was produced for the 1966 and 1967 model years. This configuration represented a popular, if not particularly high-performance, option within the fifth generation of the F-Series (1961-1966, with the 1966-67 models being largely carryovers). Positioned as a work-oriented truck, it offered a balance of affordability, durability, and ease of use, appealing to buyers who prioritized practicality over outright speed. It was a transitional model, bridging the gap between earlier, simpler designs and the more sophisticated trucks that would follow in the late 1960s and 1970s.

Technical Specifications

Powertrain & Engine Architecture

The heart of this F-100 variant was the Ford 300 cubic inch (4.9L) inline-six engine. This engine, designated as the 300 Six, was renowned for its incredible durability and longevity. It featured a cast iron block and head, a relatively simple overhead valve (OHV) valvetrain, and a two-barrel carburetor. The 8.4:1 compression ratio was typical for the era, balancing performance and fuel economy. The engine’s design prioritized low-end torque, making it well-suited for hauling and towing. The Cruise-O-Matic transmission was a three-speed automatic, known for its smooth operation, though not particularly fuel-efficient by modern standards. It was a fully automatic transmission, meaning it didn’t require manual gear selection, simplifying the driving experience for many users.

Driving Characteristics

The 170 horsepower and 283 lb-ft of torque delivered by this combination provided adequate, but not exhilarating, performance. Acceleration was modest, and the truck wasn’t designed for quick speeds. However, the 300 Six’s strong low-end torque made it capable of handling moderate loads and navigating hilly terrain without excessive strain. The automatic transmission, while convenient, did rob some power compared to the available three-speed manual. Gear ratios were optimized for work, with a focus on pulling power rather than high-speed cruising. Compared to the optional V8 engines offered in the F-100, this 300 Six automatic was significantly slower, but it offered better fuel economy and a smoother, quieter ride.

Equipment & Trim Levels

The F-100 with the 300 Six and automatic transmission typically fell into the mid-range of available trim levels. Standard features included a basic interior with vinyl upholstery, a simple dashboard layout, and a heater. Optional extras included a radio, upgraded interior trim, power steering (a relatively uncommon option at the time), and various bed configurations. The F-100 was largely utilitarian in its design, with a focus on functionality rather than luxury. The interior was designed to withstand heavy use and was easily cleaned.

Chassis & Braking

The F-100 chassis was a traditional body-on-frame construction, providing a robust and durable platform. The front suspension utilized independent coil springs, offering a reasonably comfortable ride for a truck of its era. The rear suspension consisted of leaf springs, designed to handle heavy loads. Braking was accomplished via drum brakes on all four wheels. Power steering was an optional extra, and without it, steering required considerable effort, especially at low speeds. The tires were typically bias-ply, offering good durability but less grip than modern radial tires.

Market Reception & Comparison

The 170 hp 300 Six automatic F-100 was generally well-received by buyers seeking a reliable and affordable work truck. Critics acknowledged its durability and ease of use, but often noted its lack of performance compared to V8-powered models. Fuel economy was considered reasonable for the time, though significantly lower than modern standards. Compared to the more powerful V8 options, the 300 Six automatic was favored by those who prioritized fuel efficiency and a smoother driving experience over outright power. The V8s were more popular with those who frequently towed heavy loads or needed more acceleration.

Legacy

The Ford 300 Six engine has earned a legendary reputation for its longevity and reliability. Many examples remain on the road today, often with hundreds of thousands of miles on the odometer. The powertrain, while not particularly sophisticated, proved to be remarkably durable and relatively easy to maintain. In the used car market, F-100s equipped with the 300 Six are often sought after by enthusiasts and those looking for a classic truck that is relatively simple to repair and maintain. Parts availability remains good, and the engine’s simplicity makes it a favorite among those who prefer to work on their own vehicles. The 1966-1967 F-100 with the 300 Six automatic represents a solid, dependable truck from a pivotal era in American automotive history.