Hi Stuart, thanks for that information. I need to get a copy of that book - have the pages you posted all come from "DW Munro's 1960 7th edition book" that you referred to in a previous post?......
Only the first two pages came from DW Munro's book. The last page I printed out from somewhere, don't remember where.
Here's what you are looking for. It is a useful little book.
Neil, I've just reviewed the data......and the cam numbers in the table correspond to 'Sand Racing' or 'Road Racing' type A Cam. So, if I'm reading things correctly, type A cams should have .001" valve clearence, yes?
I realize I'm repeating what Neil wrote but yes, .001" would be correct for those numbers. BUT, the cams could have been reground. It's worth mentioning since it does have the racing cam numbers in it. I apologize for not mentioning it earlier and if this just adds to the confusion.
One way to know is to inspect the cams closely for signs of re-work ie welding or freshly ground looking wear surfaces, non original (Original was a blued finish) surface finish to the gear, OR, other numbers engraved on it.
Another way is to dive into the technical details and use a degree wheel to identify the cams opening and closing events. You can also observe the base circle (Slight travel on a dial indicator while the valve is closed) for any sign of quietening ramps.