Valve Spring Specs: p/n 660-221435-16

• Type of Spring: Polished Double Coil without Damper
• Installed Height and Pressure: 1.800 in. @ 170 lbs.-in.
• Open Height and Pressure: 1.110 in. @ 450 lbs.-in.
• Spring Rate: 394 lbs.-in.
• O.D.: 1.340 in.
• I.D.: 0.726 in.
• Coil Bind height: 1.050 in.
• Weight: 94 grams
• Damper Included: No 

Valve Lock Specs: p/n 660-13098-16

• Material: Machined Steel
• Lock Angle: 7 Degree
• Valve Stem Diameter: 8 mm (.3135 in.)
• Installed Height: Standard
• Valve Stem Groove Type: Single Radius Chevy LS
• Weight: 2.6 grams

Valve Stem Seal Specs: p/n 660-24042-16

• Material: Viton
• Valve Stem Diameter: 5/16 in. / 8 mm
• Guide O.D.: 0.500 in.
• Installed Seal O.D.: 0.608 in.

CNC Machined I.D. Spring Locators p/n 42168-8 (Intake), 42169-8 (Exhaust)

7 Degree Titanium Retainer p/n 23606-16