STK Performance Racing Dual Valve Spring Kit 6mm BMW M52

Product Overview

High-performance dual valve spring kit for BMW M52 engines. Manufactured from premium Chrome Silicon steel with Chromoly retainers and inner spring locators. Purpose-built for motorsport and high-RPM applications. Eliminates valve float and maintains precise valve control.

Engine Applications

Fits: E34 5 Series · E36 3 Series (sedan / coupe / convertible) · E36 Compact 323ti · E38 7 Series · E39 5 Series · E46 3 Series · Z3 Roadster (E36/7) · Z3 Coupe (E36/8)

Engine codes
M50 — M50B20, M50B20TU, M50B24TU, M50B25, M50B25TU
M52 — M52B20, M52TUB20, M52B24, M52TUB24, M52B25, M52TUB25, M52B28, M52TUB28
M54 — M54B22, M54B25, M54B30
S50 / S52 / S54 — S50, S52B32, S54

What's Included

• 24 × Inner Valve Springs
• 24 × Outer Valve Springs
• 24 × 6mm Chromoly Retainers
• 24 × Inner Steel Valve Spring Locators

Technical Specifications

Seating Pressure 37mm 95lbs Full Lift Pressure = 240lbs

Material Specifications

Valve Springs: Premium Chrome Silicon Steel (CrSi) - Dual spring configuration Retainers: 4130 Chromoly Steel - Precision-machined, reduced mass Performance Rating: 8500 RPM capability Lift Capacity: Up to 14mm camshaft lift

Key Benefits

Superior valve control at high RPM Protection against coil bind and valve float Compatible with aggressive camshaft profiles Track-proven reliability

Application

Designed specifically for BMW M52 engines.

Installation Notes

Professional installation recommended. Verify spring heights and valve travel. Not a straight forward replacement kit.