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Ford 312 V8 Engine

The Ford/Mercury 312 V8 engine was the heart and soul of the Ford Thunderbird and most Mercury models beginning in 1956. The 312 was the last of Ford’s Y-block engines. Other Y-Blocks such as the Ford 272 V8 and the Ford 292 V8 were so named due to the y-shaped cylinders.

The 312 was used in cars with 2 and 4-Barrel carburetors and was sometimes known as the “Thunderbird Special V8.” For the 1957 models, Ford dealers provided a Paxton supercharger that allowed vehicles to reach 300 horsepower. The 1956 Mercury cars contained the 312 and, depending on the model, were sold with 210, 225, 235, and even a 260 horsepower 312 engine. A special “M 260” engine kit was sold by Mercury dealers that year to boost the horsepower to 260. The kit contained two 4-barrel carburetors along with a specialized camshaft and cylinder heads.

By 1960, the 312 was reduced to a 2-barrel carburetor economy engine and phased out in 1961. The 312 remains popular, especially for 1957 Ford and Mercury model devotees.

 

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Engine Specifications

1957 Ford Thunderbird Special 312 V8 with 4-Barrel Carb
Max Brake Horsepower - 245@ 4400 rpm
Max Torque – 332 @ 3200 rpm
Stroke - 3.44
Bore – 3.8
Compression – 9.7
Firing Order - 15486372

1957 Ford Thunderbird Supercharged 312 V8
Max Brake Horsepower - 300@ 4400 rpm
Max Torque – 327 @ 2400 rpm
Stroke - 3.44
Bore – 3.8
Compression – 8.6
Firing Order - 15486372

1956-1959 Mercury 312 V8 with 4-Barrel Carb
Max Brake Horsepower - 210@ 4600 rpm
Max Torque – 312 @ 2600 rpm
Stroke - 3.44
Bore – 3.8
Compression – 8.0, 8.4 with automatic transmission
Firing Order - 15486372