May have it figured out.
A guy said that 2nd digit may be an R, rather than a P or D. If so, maybe it is an Erson cam. So, I looked up the Erson Pontiac HFT cams.
Their part numbers all begin with E310. But, only one of 'em ends with 11. So, I figure that ER11 is a real good ID number for an Erson #E310011 cam. I can see that it is very possible that's what is stamped on the cam. Could be wrong.
http://www.pbm-erson.com/Catalog/Ers...t_E/ERSE310011
http://www.pbm-erson.com/Catalog/Ers...e=16&criteria=
What do ya'll think ?