I could be wrong of course, but according to the 59 shop manual and the sun tune up chart, its the hash mark on a 59 wheel, clockwise from the bb.

http://chevy.oldcarmanualproject.com/shop/1959_60/59sms0704.htm

See Note 1B.

Last edited by Dragsix; 10/08/2019 3:00 PM.

Mike