BMW M40/M42/M44 Valve Spring Kit, Pro Xtreme AIM Tech Vented as well as an

Vented as well as an aluminum housing

this BMW S65 piston set features:

Designed for high-performance S65 Stroker builds

Performance Applications:

Upgrade your BMW M52TU or M54 engine with the Ferrea Valve Kit for enhanced tensile strength

BMW M40/M42/M44 Valve Spring Kit, Pro Xtreme AIM Tech Vented as well as an5150 AutoSport Pro Xtreme Valve Springs for BMW M40 M42 M44 Engines Maximize your engines potential with 5150 AutoSport Pro Xtreme Valve Springs, designed for BMW M40 M42 M44 Engines. Whether you're building for high revving street performance or all out racing, these valve springs are built to handle engine speeds of up to 11,000 RPM with confidence. Available in two kit optionsone for 6mm valves and one for 7mm valvesyou get the flexibility to match