If I'm not mistaken--and I could be--that may be a nice little GK cam. That PN looks awful familiar! We ran these things in the '80s and early '90s, and they were sweet for a mild street car. Butler's, Incorporated in Burlington, NC sold a blue million of the things. Specs are: .480" lift, 288 degrees duration (advertised), on a 108-degree centerline. They pulled hard from around 2400-6200 in a 350 and sounded great at idle. The beauty of them was the .480" lift--it was just under the limit of the old double hump heads' lift limit before coil bind, and you could run stock diameter springs without valve float. On the negative, they didn't make a lot of vacuum, and if you had power brakes you were constantly reminded of it. If it is the same cam, you have a jewel in the rough. If you're really serious about using this cam, I can call Darrell Butler and see if he remembers the part number and can confirm it.