Manley Valve - Exhaust, Valve-S/D 1.600,+.500 mustang 4058 - 1968-1972 GM A-Body

4058 - 1968-1972 GM A-Body Rear Shock Tower Brace

Prevents valve seat damage in engines designed for leaded gasoline

0-inch diameter

as well as the hardest drag strip launches without moving on the rearend housing

This is critical as it properly locates the sway bar and prevents lateral movement during hard cornering maneuvers

Manley Valve - Exhaust, Valve-S/D 1.600,+.500 mustang 4058 - 1968-1972 GM A-BodyManley Severe Duty Valves deliver the ultimate in strength, reliability, and high performance durability. Engineered for extreme gasoline engine temperatures, these valves are crafted from exclusive materials (XH 428 for exhaust and NK 844 for intake), offering unmatched tensile strength compared to competitive alloys. In fatigue testing at 40,000 psi and 1400F, Manley exhaust valves endured 100 million cycles, while competitors failed after just