Abstract: A system and method for reducing or eliminating the flexing of an engine rocker shaft at high RPM conditions. In one aspect of the invention, an elongated block stud is utilized in conjunction with a rocker shaft pillar mount to more securely hold the rocker shaft in position by having all forces transmitted to a block stud which is secured to the engine block. In a second aspect of the invention, a two-piece rocker shaft center support is utilized with the lowermost piece being secured to the cylinder head by a block stud threaded into the engine block. The rocker shaft thus is secured in position along its full length between each rocker arm no matter what cylinder head configuration is encountered.