I sent this post over to my dad to see if he could figure it out.
This is what he said,
On the cam, the 206 number has to be at .050". And that would make the quoted open and close numbers be at the advertised duration. The open/close numbers at .050" are considerably different. But the fact is that both are at 107 lobe center.
The cam runs at half speed of the crank - all duration and open/close numbers are referenced to the crank. So a one degree change at the cam changes the numbers at the crank by two degrees. Thus, the owner put in an inaccurate 4 degree key, and that advanced the timing by 7-8 degrees. If he wanted 4 degrees advance, he should have used a two degree key.
Also, its very hard to find a off set key big enough for the crankshaft. To get corrected, you need to change the cam key. You got the gear off once, it should come off again. Joe
