Manley Valve - Exhaust, Valve-S/D 1.880,+.100 Chevrolet by nearly eliminating the deflection

by nearly eliminating the deflection seen in stock cradle bushings

The PHR006 features BMR's CNC-machined center adjuster

-inch adjusters used by the competition

The XSB005 gives you as much as 4

Manley Valve - Exhaust, Valve-S/D 1.880,+.100 Chevrolet by nearly eliminating the deflectionManley 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