I may know a little about this....
It is my understanding, that there were a couple different configurations for
the crankcase ventilation on the early 1500 roadsters. The earlier (63, 64)
have a breather tube that goes from the engine backing plate to the upper,
left, rear corner of the block. These used a breathable oil cap like on the
1000 and 1200s....an odd looking, painted cap containing metal mesh as a
filter. There was no rear hole in the valve cover. The other configuration,
is a two piece oil cap (usually chrome) with a tube that connects to the air
cleaner. Again, no hole in the valve cover. The 1965, R16, I believe, was
when it changed to the vented valve cover we all know and love. Regarding the
mechanical purpose of "crankcase ventilation", I've no clue.
Patti
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