For both small and big block engines with inline bolt mounting. Dual bolt pattern which fits either 153 or 168 tooth flexplates/flywheels.Allows starter to be used with automatic or manual transmissions. 2 wire hookup.It is good for improving oil pan and exhaust clearance. This starter is rated at 3.0kw, which converted to horsepower, comes out to 4.00HP. The gear reduction starters producing up to 50% more cranking power over stock starters. Straight across bolt pattern. The weighth of it is only 11.5 lbs and the length of it is 9" in total .Allowing better clearancing. Comes with correct bolts and shims. Single Package: A brand new starter + bolts and shims.