Compared to OEM bearings

G40 Dimensions

While we highly recommend replacing or upgrading your VANOS oil pump

Maintains full use of Valvetronic and Dual VANOS for great throttle response and wide power band

B46 Combustion Chamber Upgrade Service S85 Rod Bearings Compared to OEM bearingsPlease note that pricing is based on the customer providing a core. If you need assistance sourcing a core, contact our sales team. For enthusiasts and builders pushing the limits of BMWs B46 engine, optimizing the combustion chamber is a critical step toward maximizing performance and reliability. The 5150 Combustion Chamber Upgrade Service reshapes the combustion chambers using state of the art 5 axis CNC equipment for improved flow, consistency,