322ci. engines, were Buick engines, used in 1956, & 1957 Chevrolet Heavy Duty 7000-10000 series trucks. I've seen some reference of them also being used in some 1958, & 1959 Chevy 70-100 series Heavy Duty Trucks, but have personally only seen the Big Block 348 Chevy engines in '58, & '59 models.
