Thanks, I also have one 2446 with just the dot which is a repro (Pearson). My original 2446 has both marks, so i have used this original clubmans exhaust cam on the scrambler inlet.
Can you please help me out with the ignition timing for the scrambler set up? It seems to me that i should be using 36 deg BTDC fully advanced, but not all clear. The engine is a 1960 m DBD with 2 x 2446 cams fuel = 99 octane.