Bolt-on more output voltage for your Ford TFI Ignition! Turns ratio: 85:1 Primary resistance: .680 ohms Secondary resistance: 4.8K ohms Inductance: 5.6 mH Maximum voltage: 44,000 Volts WARNING: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.