DC/80/RSR Cams, you can see the cam lobes compared to the stock cams. These are a little more agressive that the 993 RSR cams. Duration @ 1mm Intake 283 vs 280, Exhaust 264 vs 264. The lift is also a little higher on the Intake side 0.505 vs 0.490. Exhaust being the same. Another difference between my cams and the RSR;s is the lobe center separation. Mine being 108 Degrees vs 109 for RSR. Last difference is the lift at over lap (how you setup the cam timing) 5.1mm vs 4.6 for the RSR.