Compatible with both 13B and 20B (Mods Required for 20B) engines. Features include: Lightweight 7075 billet alloy CNC design. Proven reliability. Will suit both street driven and racing applications. OEM replacement. Replaceable wear face with advanced screw type retainer design Perfect for Hi Rpm engines Can be used with standard crank and also 2 piece cranks. Extra cost for centre bearing support. (Please contact us to specify if you require needle bearing to suit your eccentric shaft.)