Upgrade your valve train with Kibblewhite Lower Valve Spring Collars. These high-quality collars are engineered for superior performance and durability, ensuring optimal valve spring function in your high-performance engine. Sold as a 4 pack, these collars will improve the longevity of your valve train. Description Kibblewhite Lower Valve Spring Collars are meticulously machined from heat-treated steel to provide exceptional strength and wear resistance. The counter-bored design maximizes retainer-to-seal clearance, preventing interference and ensuring smooth valve operation. These collars are precisely machined to fit a 0.725" outer diameter seal and a 0.625" valve guide, providing a secure and accurate fit. Designed for both intake and exhaust valves, these collars are a crucial component for maintaining valve train stability and performance. Proudly made in the USA, Kibblewhite collars embody quality craftsmanship and performance you can rely on. Features & highlights Maximize retainer-to-seal clearance with the counter-bored design. Precision machined to fit 0.725" OD seals and 0.625" valve guides. Manufactured from heat-treated steel for exceptional durability. Suitable for both intake and exhaust valve applications. Ensures smooth valve operation and prevents interference. Proudly made in the USA, ensuring top-tier quality and reliability. Sold as a convenient four-pack for complete valve train upgrades. Technical specifications Brand: Kibblewhite Part Number: 20-20855 Application: Exhaust, Intake Collar Material: Heat-Treated Steel Product Name: Collar Type: Valve Spring Units: 4 Pack Important to know Ensure compatibility with your specific engine and valve train components before installation. Professional installation is recommended for optimal performance.