Rear Thrust Conversion Service for Subaru EnginesSubaru boxer engines are typically manufactured with either a rear position or central position thrust bearing. For those working with classic Subaru engines, the center thrust bearing design can be a limitation when upgrading to a stronger, new age crankshaft, which is designed for rear thrust bearings. Our Rear Thrust Conversion Service addresses this by carefully machining the two block halves, allowing older, center thrust engines to be upgraded