Manley Valve - Exhaust, Valve-S/D 1.625,+.700 1984-pontiac-firebird-esi1382254 Drag ''R'' Series and non-adjustable

Drag ''R'' Series and non-adjustable valving allows for your choice of ride quality

Heavy Duty

The polyurethane bushing set-up on one end and QA1 spherical rod end on the other allow for free movement of the rear end

big block drag race

Manley Valve - Exhaust, Valve-S/D 1.625,+.700 1984-pontiac-firebird-esi1382254 Drag ''R'' Series and non-adjustableManley 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