In order to get 418 cubic inches out of a 351 Cleveland, it requires a 4.100-inch stroker crank and custom pistons--the ones in Gagnon's '71 coming from Ross. The 351 Cleveland Boss appeared in 1971 and had 4-bolt main caps, 4V-type quench chamber heads with pedestals machined to accept a Boss 302 valvetrain. With the Cleveland's 9.206-inch deck height and Gagnon's 2.05-inch crank throw, it leaves just 1.025-inch of compression height. That's about as short a piston as you'd want on a street car. Take a good look at this 418-inch Cleveland, because you won't see many of these around.