Manley 42181S-1 Performance Valve Spring Single

The Manley 42181S-1 is a high-performance valve spring engineered for demanding engine applications. Manley Performance has been a trusted name in professional motorsports and high-performance engine building for decades, manufacturing precision valve train components to exacting tolerances.

Key Features:

• Manufactured from premium, high-tensile chrome silicon wire for superior fatigue resistance and longevity under high-RPM conditions
• Precision wound to maintain consistent spring rate and installed height across the full lift range
• Engineered to resist heat fade and maintain seat pressure at elevated operating temperatures
• Designed for performance street, track day, and racing applications requiring reliable valve control
• Sold individually — confirm quantity required for your application prior to ordering

Manley valve springs are a staple in professional engine builds where consistent valve train dynamics are critical. The 42181S-1 is built to meet or exceed OEM specifications while delivering the added durability demanded by modified and high-performance engines.