Jensen
I looked at my 1960 C72 engine and it needs to be that long to clear the clutch basket. A C71 with crankshaft mounted clutch might have a shallower cover in that location, hence the shorter shaft. When they moved the clutch they needed a longer shaft.
??
G
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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe