You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.

Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.

Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.

Clearances for the King XP RB25 Main Bearings should be determined based on your specific engine build and application. Typically, for high-performance applications, aim for a clearance of 0.0015" to 0.0025". However, always consult with your engine builder to ensure optimal fitment and performance.

In most cases, the King XP RB25 Main Bearings are designed to fit the RB25 engine without modification. However, ensure that your block is in good condition and check for any wear or damage that may require machining or line boring.

For optimal performance with King XP RB25 Main Bearings, use a high-quality synthetic oil that meets the specifications for your engine. Ensure that the oil has adequate viscosity for your operating conditions, especially in high-performance or racing environments.

Yes, the King XP RB25 Main Bearings can be used in a stock RB25 engine, but they are specifically designed for high-performance applications. If you're planning to push your engine to higher power levels, these bearings will provide enhanced durability and reliability.

After installation, follow a proper break-in procedure to ensure longevity. Start with a gentle driving style for the first 500 to 1000 km, avoiding high RPMs and heavy loads. Regularly check oil pressure and temperature during this period to ensure everything is functioning correctly.