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285-65-R20
robust sound in all conditions
be resistant to short-term UV radiation
For over fifteen years MBRP inc
manley chevrolet big block exhaust valve kit 1 800in head dia 5 930in o a length 0 3415in stem 1 1992-jeep-wrangler-esi2319035 285-65-R20Manley 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
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