taking advantage of a more aggressive cam and better-flowing exhaust system. While 426 Max Wedge Mopars went undefeated in the 1963 drag racing series, they didn't achieve much NASCAR success.

and upswept exhaust manifolds, and it became the Max Wedge. In 1963, the displacement was increased slightly to 426 cubic inches (a fortunate coincidence and forerunner of the 426 Hemi), and the ...