Patrick, Can you show us a photo of the Cam and the followers, There are some funny ones around, I have a set with big round lumps on the followers !!. Sometimes there is a number stamped on the inner end of the cam, 1, or 2. Cheers Bill.
You're right there Bill. The timing diagram in "Richardson" for the Single is wrong. Slot pointing between pushrods at 4 degrees B.T.D.C. is right as long as the cam is original or has been ground to the same profiles using the original slot as the datum. There are, of course, cases where this is not so!I can't be sure ??, But I think on a Comet, That slot should be in a straight line between the pushrod tubes and the middle of the cam spindle, Slot at the top, Like the rear one on Vibrac's photo, With both valves OPEN !!.
TDC ish. Cheers Bill.
Do yourself a favor and DO NOT order a Mk 2 camshaft as they have lots of lift which means you need to make many modifications to the cases and the head to accommodate that extra travel and also they are down on power at moderate revs though they are great for race track work where the revs are much higher. For road work a Mk1 or Mk3 cam is the way to go.thanks for the answer, I also think that this cam shaft is not correct, closing the intake valve at 90 degrees is much too late. I'm going to order a new cam shaft.