Motorcycle Repair: cb450 DOHC cam markings, cam lobes, dohc motor

Question
Recently I noticed a leak in my head gasket on my 72 CB450 so I replaced it.  Upon fishing the cam chain over the DOHC motor I realized that I could not find the timing mark on the cams to line up with the bearing boss.  Of course the manual shows a blurry B/W photo.  Are the markings diamond shaped in a series of three or are they a solid line on the cam (not the casting line)?  This bike is going to be raced in a couple of weeks and I cannot believe that I can't find the marks.  The bike has been raced before but nothing inside the motor has been touched. I did rotate the cams to the furthest point away from the rocker arm hoping that maybe the mark would then become clear but no such luck. I set the cam chain in place watching the rotation of the cam lobes respectively and found a series of almost non existant diamond shaped marks. The cams are set to the Left TDC mark. When I rotated the crank over 180 deg from left TDC to line up for TDC on the right piston then on each cam there is a line that almost lines up with the bearing boss.  I am a little confused because if I set up the motor to work off of the lines then the cam lobes do not look correct like at TDC on cumbustion the exhaust valve is almost starting to open.  If I set the cams up to the diamonds then I am afriad of running 180 deg out and wacking a piston with the valve.  Any ideas on the markings or procedures to setting up the cam timing?  Thank you for your time.  Tim  

Answer
Tim, the only 450 I worked on was in 1971 and my shop manual for the bike is in DEEP storage. As I recall Honda usually uses punch marks or scribed lines for cam timing.

Here is a link that may be helpful, though.

http://www.thefang.co.uk/cb500teng.htm
Looking at the illustration at the bottom of the page, you can see that the cams are on compression stroke for the left side. Hopefully, that will get you back on track.

Bill Silver