Built from PAC's proprietary Ti-17 titanium alloy, the PAC-R536-16 delivers the same reliability as a retainer 20 percent heavier while trimming reciprocating mass from the valvetrain. It's purpose-fit for PAC's own PAC-1245 and PAC-1289 dual valve springs, making it the straightforward retainer choice when those specific springs are already installed or being ordered together.

PAC Racing Springs PAC-R536-16 500 Series Titanium Dual Valve Spring Retainer Set Features:

• Purpose-fit for PAC-1245 and PAC-1289 dual valve springs
• 1.450 in. outside diameter with a standard 10 degree lock angle
• Machined from proprietary high-tensile Ti-17 titanium alloy for maximum strength at minimum weight
• Micro-polished finish improves fatigue life versus an unfinished retainer
• Laser engraved with part number and batch identification for traceability