OEM 16661-40 W&W Aluminum Cylinder Heads 62-400
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Cylinder heads
fits 74" and 80" Flathead Big Twin 1936-1948
aluminum
nominal bore: 3-5/16 " / 3-7/16 "
compression: 5.5 : 1 (1200cc), 5.85 : 1 (1300cc)
head bolt pattern: Flathead 9 bolt
plug threads: 1 x M18 x 1.5 x 12.7 mm
replaces Harley-Davidson part number HD 16661-40, 16666-40, and 16667-40
gross weight: 6 kg