PAC 1300 Series Triple Valve Spring:

• Triple spring configuration for extreme drag race applications
• 15–30% reduction in physical mass for quicker engine response
• 1.645 in. outer diameter and 0.635 in. inner spring ID
• 689 lbs./in. spring rate with 1129 lbs. open load
• 2.200 in. installed height and 1.130 in. coil bind height
• Advanced shot-peening and nano-polishing for fatigue resistance

PAC 1300 Series Triple Valve Spring Notes:

• Designed for Top Fuel and Pro Stock high-RPM engines
• Optimized for aggressive camshaft profiles with high lift
• Not intended for street use or mild-performance builds
• Recommended for use with titanium retainers and PAC-spec hardware