508 or 509 Purple Shaft cam

http://www.chicagoconnection.us/ind...ducts_id=289&zenid=3brki78nprcllcuo899kecar43

You have the solid lift cam. See above link. Mechanical Camshaft for "A" Engine - Advertised duration:280/280, 0-Lap:68, Center Line: 106, Lift: .509/.509, Valve Lash: 28/32, Recom. Spring: P5249847, Oval-1/4 mile banked track.