Valve covers...
With a little more experience and having talked to a bunch of CMPers.... it would seem that the early military 216 used the available civy covers with the slits.... as soon as some sort of breather tube/cap was intalled the covers were no longer punched out for the slits. A variety of breather tubes/caps followed .... some original some which were added as extension to facilitate maintenance by non military owners.
Take care and thanks for sharing the info....
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Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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