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Product Description
S&S Big Port Iron KNUCKLE HEADS bare
For all 1936 - 1947 Harley Davidson Knucklehead motors
Stock type replacement heads come with Valve Guides
HEADS use special S&S 1-15/16" dia. Intake Valve
HEADS use standard 1-3/4" dia. Exhaust Valve
Heads can be used with all other original later model Knuckle Head components including Valve Covers
S&S improved Valve Covers can also be used
HEADS come machined to allow 3-5/8" Big Bore Cylinders
Made from high quality engineering grade gray cast iron with high temp black powder coat finish
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