OK, what the heck am I doing wrong?

[Jim B]

As several posts put together suggest, you should be able to come up with 10º by combining offset crank gears/keyways and cam offset bushings. What is the cam lobe centerline supposed to be on your cam? How does it check with a known good gear/chain setup? If it checks to spec (I would heartily recommend you check the cam lobe centerline) you will have to either double check the gearset, use the above combo, or have the cam replaced to solve the problem. Since it's not a DOHC motor you don't have the ability (like Art for example) to change the cam lobe center without changing the camshaft. As far as wrapping your head around the 10-20 degree concept, don't fret about it - usually a good nights' sleep lights the light bulb the next day and it magically becomes clear as day. Just think about it as a 1:2 overdrive setup...one cam revolution (360º ) drives the crank two revolutions (720 º )