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learned a 325 HP 396 (only engine option for '66 SS)
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All 1966 Super Sport Chevelles came with the base 396-325 hp engine. The 396 engine was offered in three factory horsepower ratings; the standard 325 hp, the optional 360 hp RPO L34, and the optional 375 hp engine RPO L78. The 375-hp L78 engine option was offered by Chevrolet for the ‘66 Super Sport Chevelle from day one of the ‘66 model year. At the beginning the 1966 production year, Chevrolet Marketing believed that the L78 engine option would interest only a small, specialized sector of the general car buying public. The L78 was not initially promoted by Chevrolet as an engine option to the Chevrolet dealers or the general public till around Feb. ' 66. They produced 3,099 1966 L78 SS 396 cars.
There were 46,277 L35 325 hp (1865 were in the El Camino)
There were 28,989 L34 360 hp