Powermaster "XS Torque" natural finish starter for all 390/427/428 FE engines with either a manual or automatic transmission.Powermaster's highly efficient XS Torque starters feature extra-powerful motors that churn out up to 200 ft.-lbs. of torque. Coupled with their 4.4:1 gear-reduction ratio, that adds up to reliable cranking power for engines up to a whopping 18.0:1 compression ratio. These starters come with a billet adapter/mounting block and will clear all headers. They'll also clear your oil pan if the OE starter did. Starter dyno test results are included.