Manley Valve - Exhaust, Valve-S/D 1.600,+.500 mustang Prevents valve seat damage in

Prevents valve seat damage in engines designed for leaded gasoline

Upgrade your 64-72 A-Body rear suspension with our complete rear suspension kit

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

This adjustment is made at the rear of the muffler with a wrench by either moving the valve in or out

0-inch diameter

Manley Valve - Exhaust, Valve-S/D 1.600,+.500 mustang Prevents valve seat damage inManley 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