[Jack21]

Jim,

The major cam grinders, Competition Cams, and Crane Cams go into this in great detail both in their catalogs, and on their web sites. If you're selecting a cam for your motor, you need to do some reading.

I can tell you from experience that for a street driven car, even a Cobra, that you'll be happier if you go a little conservative on the cam. Somewhere between 218 - 228 deg on the intake lobe is plenty. With a dual pattern cam, you can go 8 - 10 degrees more on the exhaust side.