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454-O EFI intake manifold is a single-plane design with a 4150 flange and can be used with standard deck blocks from 1965 to present
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5208 0441AA
Demon and Quick Fuel carburetors
manley chevrolet big block exhaust valve kit 1 880in head dia 5 464in o a length 0 3715in stem TOW 454-O EFI intake manifold isManley 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
