Powermaster designed this 9502 XS Torque Starter for GM engines using a 153 Tooth Flywheel 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 9502 XS Torque Starter Features: Starter Style: Denso Mini Flywheel/Flexplate Tooth Quantity: 153 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: 6.05 in. Weight: 8.25 lbs Quantity: Sold individually Note: All GM pad mount starters supplied with bolt/shim kit. 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.