Not your ordinary hardware store variety! Moroso Head BoltWashers are designed for the racer; machined from tough 4130 chrome moly steel, heat treated to proper hardness and parallel-ground Stress loads are more evenly distributed and torque readings more accurate Can also be used on main bearing caps, rocker arm stands, and other engine components Use them over and over again

Note: These washers are a must when using aluminum heads. Chamfered side of the washer should be toward the head of the bolt.