1968 Chevrolet Truck Engine Specificationsby Steve Johnson
The year 1968 marked the 50th anniversary of Chevrolet's first manufactured trucks. The focus of most of the trucks released in 1968 was to use smaller-displacement engines and squeeze out the maximum amount of power possible. 1968 Chevy trucks were a part of the second generation of C/K trucks, which included trucks released between 1967 and 1972.
1968 250 CID I6 Engine
Most 1968 Chevy truck base models were equipped with a 250 CID six-cylinder engine. This engine was capable of producing 155 horsepower at 4,200 rpm and a torque of 235 pound-feet at 1,600 rpm. It came standard with a three-speed manual transmission, while Powerglide and the Hydra-matic transmissions were available as optional upgrades.
1968 402 CID Engine
The C10 came equipped with the 1968 Chevy big block engine with a displacement of 402 cubic inches. The bore of the engine was specified as 4.125 inches, while the stroke was 3.76 inches. The maximum power rating was 375 hp at 5,600 rpm. The 402 was a V8 engine. This engine came standard with a mechanical cooling fan and Chevrolet cylinder heads. Also standard were HPC coated-iron 454 manifold headers. The vehicle was also equipped with 2.5-inch aluminized mufflers.
1968 350 CID Engine
The C60 came equipped with a Chevrolet 350 engine. The uniqueness of the engine stemmed from the fact that, like the vehicle, it was first released in 1968. As the name suggests, the displacement of the motor was 350 cubic inches. It had a 4-inch bore and a 3.48-inch stroke. The engine boasted a V-shaped design with eight cylinders that were evenly distributed. It could generate a maximum horsepower of 200 hp at 4,000 rpm. To boost its output, the engine was also provided with 64-cc cast-iron cylinder heads. It could be configured with a four-bolt main, with the left head having 7/16 accessory holes while the right head sported 3/8 accessory holes.
1968 307 CID Engine
A number of trucks introduced in 1968 also deployed the Chevy 307 in an effort to generate maximum power. The engine served as Chevy's smallest small block engine until 1972 and had a displacement of 307 cubic inches. The engine came equipped with eight cylinders that formed a V-shaped design. It was capable of producing a maximum of 200 horsepower at 4,600 rpm. The cylinder heads used 70-cc combustion chambers.