Harley Knucklehead 1936-39 early 4 fin rear cylinder old high compression racing

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Harley Knucklehead 1936-39 early 4 fin rear cylinder old high compression racing:
$36.00

This came off of an old 1936 Knucklehead hill climber years ago. It has been bored to 3.431 and the cylinder has also been decked (shortened) to 5.307 to increase compression for racing. One fin is damaged as shown in photo number 3. Damage to the top fin is shown in photos 4, 5 and 6. Really cool vintage racing stuff.