Supertech’s high-performance valve springs for BMW M20 engines (including M20B20, M20B23, M20B25, and M20B27) are designed for serious engine builders and high-performance enthusiasts who demand extreme durability at high RPM. Made from Superclean Chrome Silicon Vanadium Steel alloy, these valve springs deliver top-tier strength, exceptional structural memory, and extended longevity, even in intense racing conditions. Engineered with computer-aided design, they minimize wire stress and expertly manage valve harmonics, optimizing high-RPM performance and reliability. The set includes CNC-machined titanium retainers crafted from military-certified alloy, ensuring precise fitment and reduced valvetrain weight for faster response. Built to withstand the demands of high-performance BMW engines, Supertech’s valve springs and retainers offer unmatched reliability and durability, making them the premier choice for engine builders focused on maximizing BMW M20 performance. Installation requires the expertise of an engine builder. Seat Pressure: 90 lbs BMW M20B20 Applications: BMW 3 Series 1977-1982 E21 320 / 3261982-1994 E30 320i BMW 5 Series 1977-1981 E12 520 / 5261981-1987 E28 520i BMW 7 Series 1981-1987 E23 720i BMW M20B23 Applications: BMW 3 Series 1977-1982 E21 323i1982-1994 E30 323i BMW M20B25 Applications: BMW 3 Series 1985-1993 E30 325i / 325is / 325ix BMW 5 Series 1987-1990 E34 525i BMW M20B27 Applications: BMW 3 Series 1982-1987 E30 325e / 325es [North America] BMW 5 Series 1982-1987 E28 525e / 528e
