1971 Evinrude 40HP outboards Service Repair Manual, Item No. 4750, Page 8Get this manual
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CLEARANCE CHART POWER HEAD
POWER HEAD Flywheel nut Connecting rod screw Cylinder head screws 100105 Foot-pounds 348372 Inch-pounds (2931 Foot-pounds) 168192 Inch-pounds LOWER UNIT Side mounts up