King Bearings R35 Main Bearing set – STDX

STDX stands for 'Standard X-tra'. It indicates that these bearings are manufactured to provide an additional 0.001 inch of oil clearance compared to a standard OEM replacement set.

Extra clearance is typically required for high-horsepower builds that utilize thicker viscosity racing oils. The wider gap ensures proper oil flow and adequate film strength to protect the crankshaft at high RPMs.

The XPC polymer coating acts as a fail-safe. It provides superior seizure resistance during oil starvation or dry starts and reduces friction, offering a layer of protection that standard tri-metal bearings lack.

It is generally not recommended. Using STDX bearings with thin factory oil may result in lower than desired oil pressure. These are best paired with 15W-50 or 20W-50 racing oils common in built engines.

No, these are drop-in bearings designed to fit the standard block and crankshaft journals. However, you must always measure your clearances with a dial bore gauge to ensure they fall within your builder's target range.