Why It Matters
The 1966 Gran Sport used Buick's 401-cubic-inch Nailhead, advertised as a 400. The standard MR-code engine was rated at 325 gross hp; the late, automatic-only L76 path was rated at 340 hp.
Also Known As
1966 Buick Gran Sport 401 engine1966 Buick 400 engine1966 Wildcat 445 engine
