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    S&S® Fully Assembled Cylinder Head Kit For Stock or 3-5/8" Bore 1936-'47 HD® OHV Big Twins and S&S® KN-Series Engines - Gloss Black Powder Coat Finish

    Item #: 106-4929
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    S&S® fully assembled cylinder heads for 1936-'47 HD® OHV big twins are cast from high tensile, engineering grade gray iron for better than original strength, optimum heat dissapation, and low noise transfer. Kit includes front and rear cylinder heads complete with valves and .480 lift valve springs, S&S® knuckle covers, rocker arms, rocker shafts, die-cast "tins", and top covers. This is a special order part. Options include: spark plug size (stock18mm or 14mm), intake manifold style (stock plumber or oring), knuckle cover finish (as cast or polished), top cover finish (chrome, black, or silver), and cylinder heads may be ordered unpainted. Download a special order sheet at

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    Stock 1948-'65 head bolts can be used in stock bore applications. Big bore applications must use S&S® 12 point head bolts.