Powermaster Ultra Torque starters feature extra-powerful motors that churn out up to 250 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 machined aluminum adjustable mounting block. They'll also clear your oil pan if the OE starter did. Fits Oldsmobile and Pontiac. Starter bolts and shims included.