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Three in-line six-cylinder engines powered Chevrolet cars and trucks in 1966. Known as the third-generation sixes, the 194-, 230- and 250-cubic-inch engines replaced the 1937 to 1963 in-line six-cylinder powerplants.
The 194
The 194-cubic-inch six featured a single-barrel carburetor with a 3.56-inch cylinder bore and 3.25-inch stroke. It had an 8.5-1 compression ratio to generate 120 horsepower and 177 ft.-lbs. of torque. It powered the 1966 Chevy II, Chevelle and GMC trucks. Chevrolet phased it out after 1967. A three-speed manual or Powerglide automatic transmission matched the engine.
The 230
The 1966 Chevelles, El Caminos and Novas could be equipped with the 230-cubic-inch in-line six. The engine had a single-barrel carb, a 3.87-inch bore, 3.25-inch stroke and 8.5-1 compression ratio. It developed 140 horsepower and 220 ft.-lbs. of torque. Chevrolet kept the engine until 1969. The three-speed manual or automatic complemented the engine.
The 250
The 1966 Chevrolet Impala and Chevy station wagons and trucks received the single-barrel carb, 250-cubic-inch six as the base engine. It had a 3.87-inch bore and 3.53-inch stroke with an 8.5-1 compression ratio. It developed 155 horsepower and 235 ft.-lbs. of torque. It continued to power Chevys and GMC trucks through 1984. The three-speed manual or automatic came with the engine.
