17-22+ Camaro LT4 Polished NexTek H.P. Double Valve Spring Kit, Manley

Manley NexTek (Next Generation) Valve Springs were developed over a decade ago and still offer unequaled performance. These durable springs are able to satisfy the demands of top-level engine builders who need the absolute highest-quality valve springs available. Manley Nextek springs can be found in drag race applications ranging from Bracket racers to Top Fuel, oval track engines across the country, and muscle cars on the street and strip.

• Manufactured from HiTensile Chrome Silicon steel
• Shotpeened to MIL Specs for maximum fatigue life
• Proprietary multi-step heat treating minimizes load loss
• Tightly controlled open end flatness reduces valve stem side loading
• Tip thickness designed to eliminate overload breakage
• Specially processed premium-grade chrome silicon that is virtually free of impurities or surface irregularities
• Available in Polished and Super Finished versions to reduce friction, improve fatigue life and minimize load loss
• Super Finished is a multi-step surface enhancement that significantly improves fatigue strength 

 Valve Spring Specs: p/n 221436-16 

• Type of Spring: Polished Double Coil without Damper
• Installed Height and Pressure: 1.800 in. @ 155 lbs.-in.
• Open Height and Pressure: 1.110 in. @ 405 lbs.-in.
• Spring Rate: 379 lbs.-in.
• O.D.: 1.295 in.
• I.D.: 0.676 in.
• Coil Bind height: 1.100 in.
• Weight: 93 grams
• Damper Included: No  

Valve Lock Specs: p/n 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 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 42162-8 (Intake), 42165-8 (Exhaust)

7 Degree Titanium Retainer p/n 23602-16 (Intake), 23623-8 (Exhaust)