Manley 11250-1 - Gen II Race Series 48mm Head Dia 137.9mm Length Race Series Intake Valve (SINGLE VALVE)

Manley 11250-1 - Gen II Race Series 48mm Head Dia 137.9mm Length Race Series Intake Valve (SINGLE VALVE)

VALVE-GEN II 48 mm .2750 STEM 5.430 O/A 10 X 3/8 .050 MARG .080 SEAT 5 DEG DISH

Manley 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 1400°F, Manley exhaust valves endured 100 million cycles, while competitors failed after just 100,000, proving a 1,000× longer fatigue life. Each valve features chrome stems, hard tips, and swirl-polished underheads with fully machined combustion faces for superior airflow, efficiency, and wear resistance. Built for those who demand race-winning strength and precision, Manley Severe Duty® Valves set the industry standard for performance and endurance.