Forged Racing Excellence For BMW S63B44 Engines

Engineered for builders who demand uncompromising strength, reliability, and precision, Diamond’s new S63B44 forged piston series delivers race-proven performance in a ready-to-ship package. Derived from our record-setting forging architecture, this piston design provides exceptional structural integrity with enhanced crown thickness, reinforced skirt geometry, and premium components throughout—giving engine programs the confidence to push beyond 1,400 horsepower. 

Whether your application calls for extreme boost, aggressive calibration, or nitrous-assisted power, these pistons provide the durability, control, and repeatability required for high-output S63 platforms. 

• 3D milling on piston crowns for ready to install finish 
• Side gas ports for better ring seal 
• Top ring down dimension: .300" 
• Moly skirt coating for friction loss and skirt wear protection 
• Premium H-13 .225W wrist pins included 
• Premium 1.0mm x 1.2mm x 2.8mm ring package included 
• Oversized valve pockets - for larger than stock valve sizes 
• Valve pocket depth: .195" intake and .195" exhaust 
• 2618 material for High HP/Boost applications - rated for 1,400+hp