manley chevy ls 1 small block 2 055 pro flo severe duty exhaust valves set of 8 Fuel Filter Long life Urethane bushing design

Long life Urethane bushing design allows for greater flex without breaking and will not pound out or seize due to the elements

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manley chevy ls 1 small block 2 055 pro flo severe duty exhaust valves set of 8 Fuel Filter Long life Urethane bushing designManley 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