Spring Shims - 1.040 OD .030 Thick

PAC RACING SPRINGS Spring Shims - 1.040 OD .030 Thick are precision-engineered components tailored for high-performance engine builders and racers who require precise control over spring rates. These shims are essential tools for adjusting valve spring preload in both dual-spring and single-spring configurations, enabling tuners to optimize valve lift characteristics across various RPM ranges.

Manufactured by PAC RACING SPRINGS, these shims feature a 1.040-inch outer diameter and a .030-inch thickness, allowing for fine adjustments to spring pressure without the need for excessive material removal. Their precise thickness ensures that engine builders can achieve the desired spring pressures critical for maintaining optimal valve train geometry and preventing issues such as coil-bind or insufficient spring tension.

Engine builders, performance shops, and motorsports enthusiasts will find these shims particularly beneficial when fine-tuning valve spring pressures for various applications, including cammed engines and both turbocharged and naturally aspirated builds. Their compatibility with standard 1.040 OD spring seats makes them a versatile choice for many performance setups.