How does it work. like our holdens have a 12 hour clock as in on a engine block.
I was reading the early Chev motors have a 10 hour clock and the first shift starts at 7.00AM to 4PM and this ID has a flat screw head in the center type casting. and the second shift has it's ID as a round headed cast screw.
The first shift ID at 7.00AM on the chev is that the clock hand is pointing straight up as in like 12 o clock position.

Now our holdens have a flat headed screw and a round headed screw to. but in front of the date code.
Do holden cast 24/7
Has anyone seen the clock hand pointing at 9.00 or to 11.00 as i cant remember seeing that.