"They must enter thru the timing hole".

Maybe that is why Chevrolet had a rubber plug for that hole.
Attachments
plug 1.JPG (11.11 KB, 96 downloads)
plug 2.JPG (12.29 KB, 96 downloads)
plug envelop.JPG (13.3 KB, 97 downloads)


See the USA in your vintage Chevrolet!
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