PAC's 500 Series retainers are built from proprietary high-tensile Ti-17 titanium alloy, giving the same reliability as a retainer 20 percent heavier while shedding the reciprocating mass that limits high-RPM valvetrain stability. The PAC-R508-16 is sized for most 1.050 in. I.D. dual drag race springs, making it a common fit for professional and severe-duty racing engines that spend extended time at high RPM.

PAC Racing Springs PAC-R508-16 500 Series Titanium Dual Valve Spring Retainer Set Features:

• Fits most 1.050 in. I.D. dual drag race valve springs
• 1.365 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