This high-performance head stud kit is designed to replace the factory head bolts BMW# 11127838831 and ensure your engine can withstand the extreme conditions of high-performance driving

+ 15-19hp gain over 'Euro-style' headers

Stock BMW valve springs are not designed to handle the stress of performance camshafts or forced induction

- Designed to withstand whatever you throw at it

BMW N63 S63 Connecting Rod Set by Manley H-Beam S85 Valves This high-performance head stud kitAchieve superior engine performance with the Manley H Beam Connecting Rod Set, specially designed for BMW N63 and S63 engines. These 4340 forged steel rods are trusted in both street and track applications for their lightweight design and ability to handle extreme loads. Each rod measures 138. 5mm, perfectly matching the OEM dimensions for seamless installation. These rods are a direct replacement for BMW part #11247646892, #11247843237, #11247603480,