PAC's 600 Series retainers use a reduced-step, high-hardness tool steel design built specifically to pair with matching PAC valve springs, in this case the PAC-1530 and PAC-1335 dual springs. The high hardness of the steel gives the retainer strong abrasion resistance and fatigue strength while keeping weight down versus a standard-profile steel retainer, and it must be run with a matching seat where the application calls for one.

PAC Racing Springs PAC-R632-16 600 Series Tool Steel Dual Valve Spring Retainer Set Features:

• Purpose-fit for PAC-1530 and PAC-1335 dual valve springs
• 1.250 in. outside diameter with a mini 8 degree lock angle
• Reduced-step tool steel design; must be paired with a matching seat where applicable
• High-hardness steel improves abrasion resistance and fatigue strength versus a standard retainer profile
• Micro-polished and Nano-Peen treated to extend retainer service life