Crane Cams 730-0091 PS91 Performance Coil Primary and secondary resistance is 0.43 ohms, 3.0 kohms Up to 70 percent higher energy at spark plug than stock coils Primary and secondary inductance is 5.5 mH, 16 H Dimension of the coil is 4-1/2" length, 3-1/2" width and 3-1/2" height Turns ratio of the coil is 54:1