PAC-1281X-16 Valve Springs, 1200 Series Drag Race, Beehive, Single, 0.551 in. Maximum Valve Lift, 245 lbs./in. Rate, Ford, 5.0L Modular V8, Set of 16

Valve Springs, 1200 Series Drag Race, Beehive, Single, 0.551 in. Maximum Valve Lift, 245 lbs./in. Rate, Ford, 5.0L Modular V8, Set of 16

PAC Racing’s Street Performance RPM Series Beehive Valve Springs are constructed using our signature PACaloy super clean wire and are heat-treated in-house for precision spring rates and improved strength. They also receive a multi-peen process, polishing, and a Nano-Peen™ proprietary surface treatment for service life optimization.

Built using our signature PACaloy super clean wire to ensure strength and durability
In-house heat-treating for precise spring rates and increased strength
Multi-peen process to optimize service life
Polishing to improve operating cycles
Nano-Peen™ proprietary surface treatment

Outer Diameter – Outer Valve Spring    
Top 0.849 IN / Bottom 1.031 IN

Inner Diameter – Outer Valve Spring    
Top 0.527 IN / Bottom 0.709 IN

Installed Height    
1.811 IN

Installed Load    
80 PS

Open Height    
1.260 IN

Open Load    
214 PS

Open Load / Height (Valve Open)    
214 LB @ 1.260 IN

Valve Spring Rate    
245 PS

Max Coil Bind    
1.208 IN

Max Valve Lift    
0.551 IN

Recommended Valve Spring Retainer – 300 Series    
R364

Recommended Valve Spring Retainer – 400 Series    
R464

Valve Spring Series    
RPM Series

Valve Spring Type    
Ovate Wire Beehive

Primary Market    
Street Performance