Thanks to all who responded.  Mystery solved !  I have never worked on any boxer engines except the water boxer.  AND, up until now the cam that was in the engine I was rebuilding was good so I never have needed to replace a cam.  Now I have learned one more thing, never a day goes by without learning something new, even at 73 !  
	
> On May 18, 2016, at 12:00 AM, Automatic digest processor <LISTSERV@GERRY.VANAGON.COM> wrote:
> 
> I'm fairly certain those are the gear pitch numbers.   They should match
> the gear pitch on the crank gear for the proper mesh.

Cheers,    

Frank Condelli
Almonte, Ontario, Canada
'87 VW Westy, '00 Kawasaki 250 Sherpa, "98 Ducati 750 Monster & Lionel Trains (Collection for sale <http://frankcondelli.com/trainsal.htm>)
Frank Condelli & Associates <http://www.frankcondelli.com/> - Vanagon/Vanagon Westfalia Service in the Ottawa Valley
BusFusion <http://www.busfusion.com/> a VW Camper camping event, Almonte, ON, June 02 ~ 05, 2016