Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 101Get this manual

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CYLINDER HEAD
Margin Thickness

ValveNalve SeatNalve Guides: Valve Clearance (cold) Intake Exhaust Valve Dimensions: "A" Head Diameter Intake ExhaustB" Face Width Intake Exhaust "C"

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