For SBC BBC Chevy 3HP Mini Starter Black Dual Inline 153 168 Tooth 305 350 396 454 Fitment:Works for both small and big block engines with inline bolt mounting. Has dual bolt pattern that allows it to be used with either 153 or 168 tooth flexplates/flywheels for automatic or manual transmissions. Also works for Chevy 90 V6s. 3 horsepower for superior performance. These gear reduction starters produce between 30-50% more cranking power than stock starters.