installed on an AMC 304. The previous camera was removed so I settled on this 280H from Comp Cams. Very, very aggressive sound for a 304. Unfortunately, the locks didn't fit my factory valves. I also used Felpro valve seals instead of Comp cams. The dealer said they were better. If I could rebuild I would probably choose a slightly less aggressive cam for my 304 due to the low level required for my Jeep. Most likely there will be a new intake and carburetor due to the aggressiveness of this cam.