Why It Matters
Buick called this 401-cubic-inch Nailhead the Gran Sport 400 in sales literature. The 1965 assembly used a four-barrel carburetor and was rated at 325 gross horsepower and 445 lb-ft of torque.
Also Known As
1965 Buick Gran Sport 401 engine1965 Buick 400 engine401 CID four-barrel Nailhead V8
