Crankshaft degrees are directly proportional to piston position. For example, when the No. 1 piston is at TDC, so is the No. 6 piston. You can degree both at the same time. Although most engine builders degree cams on the No. 1 cylinder only, we suggest degreeing all eight cylinders for added assurance. The best approach is to follow firing order. Document information from all eight bores and compare findings. This provides the most accurate cam-timing information possible.