Powermaster designed this 9503 XS Torque Starter for Small Block Ford engines using a 157 or 164 Tooth Flexplate 3/4" depth that have up to an 18.0:1 compression ratio! The 4.4:1 gear reduction ratio on this natural Denso-style mini starter supplies reliable cranking power, while the InfiCLOCK system provides 360-degrees of rotation to clear most oil pans and headers. This starter is an excellent choice where heat soak, limited space or hot starting is a concern, while the billet aluminum adapter block helps the XS Torque line to be the lightest 200 ft/lb starter available! Starter dyno test results are included. Powermaster 9503 XS Torque Starter Features: Tech Bullet: TB102 Starter Style: Denso Mini Flywheel/Flexplate Tooth Quantity: 157/164 Gear Reduction: 4.4:1 Maximum Compression Ratio: 18.0:1 Cranking Power Ft/Lbs: 200 Color: Natural Adjustable Mount: Yes Starter Rotation: Standard Mounting Block Material: Machined Billet Aluminum Length: 6.21 in. Weight: 8.50 lbs Quantity: Sold individually Powermaster produces alternators and starters for both street rod and racing applications. They also offer related accessories, including brackets, wiring harnesses, pulleys, and drive kits.