Manley Valve - Exhaust, Valve-BBC PONT S/D 1.900 NA 2653-1 - 1970-1981 GM F-Body

2653-1 - 1970-1981 GM F-Body Upper A-arms

and ensure consistency on the track

which causes the spring to load and unload

With left and right hand threads

Polyurethane

Manley Valve - Exhaust, Valve-BBC PONT S/D 1.900 NA 2653-1 - 1970-1981 GM F-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