Knucklehead 5 Fins Cylinders

The following image present the early 4 fin type cylinders (Left Pair) which related to the E - EL 61" ci. engines 1936-1940, and the 5 fins type cylinders (right pair)related to the F-FL 74"ci. Knucklehead engines 1941 - 1947, the term 4 or 5 fins relate to the upper group of the fins which the heads tightening bolts are passing through, there is also a slight difference in the casting shape which can be seen on the top gasket surface, the 5 fins cylinder required a longer set of head bolts...

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