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Cylinder head set; fits 45” models 1936-1973; aluminum; nominal bore: 2-3/4 ”; compression: 5.1 : 1; head bolt pattern: Flathead; plug threads: 1 x M18 x 1.5 x 12.7 mm; replaces OEM 16692-40, and 16695-40; gross weight: 4.9 kg

Aluminium cylinder heads for Flatheads. Harley-Davidson decided to use aluminium cyclinder heads in 1940, as these have much better heat dissipation abilities than comparable cast-iron cylinders heads. Set of front and rear cylinder head.

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