|From my search of the forum, no specific indications of the sizes of bolts for the keel. I have a markI. The forward and aft are less than 1-1/4 but more than 1" and the two middle ones are more than 1-1/4". Already bought these 2 deep sockets. Will go get more today but would like to zero in.
C&C 27 Mark 1 1971 Parsifal
Bronte Harbour Marina