Powermaster Ultra Torque Starter Are Rated Up To 18:1 Compression With 250 Ft-Lbs of Cranking Torque. With 3.4HP and a 4.4:1 Gear Reduction These Starter Can Keep Up With The Most Demanding Engines. 2 Position Rotation Billet Aluminum Mounting Block. All Powermaster Starters Come With Our Dyno Tested Proof Of Performance Guarantee. Made in USA.