manley chevrolet big block exhaust valve kit 1 880in head dia 5 464in o a length 0 3715in stem TOW 1991-1993 Mercury Cougar XR-7 1979-1986

1991-1993 Mercury Cougar XR-7 1979-1986 Mercury Grand Marquis Base 1979-1986 Mercury Grand Marquis Colony Park 1987-1991 Mercury Grand Marquis GS 1983-1991 Mercury Grand Marquis LS 1979-1982 Mercury Marquis Base

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5208 0441AA

Advanced design with EPDM rubber compound for quiet

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

manley chevrolet big block exhaust valve kit 1 880in head dia 5 464in o a length 0 3715in stem TOW 1991-1993 Mercury Cougar XR-7 1979-1986Manley 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