The standard engine was an overhead-valve inline-six with cast-iron block, displacing 250 cubic inches or 4.1 liters. This engine made approximately 120 horsepower and 205 foot-pounds of torque, and featured a Rochester two-barrel carburetor. For the K20 and K30 a bigger version of the six could be ordered -- it displaced 292 cubic inches, or 4.8 liters, and produced 115 horsepower and 315 foot-pounds of torque. K10 buyers could order a four-barrel V-8 displacing 305 cubic inches, or 5 liters, which produced 165 horsepower and 240 foot-pounds of torque. Optional across the line was a four-barrel 350-cubic-inch, or 5.7-liter, V-8, producing 165 horsepower and 275 foot-pounds of torque. Also available for all models was a diesel V-8 with cast iron block displacing 379 cubic inches or 6.2 liters, producing 130 horsepower and 240 foot-pounds of torque.