PAC-1218X-16 Top 0.650 in. / Bottom 0.885 in. ID – Top 1.055 in. / Bottom 1.290 in. OD – 1.800 in. installed Height – 0.600 in. Max Valve Lift

Top 0.650 in. / Bottom 0.885 in. ID – Top 1.055 in. / Bottom 1.290 in. OD – 1.800 in. installed Height – 0.600 in. Max Valve Lift

PAC Racing’s 1200 Series Ovate Wire Beehive Valve Springs are a budget-minded spring designed for the rigors of street driving with occasional track days in the mix. This is the perfect spring for your street/strip terror. Applications include Ford 2V Mod Motor, GM Gen III/IV LS, Big Block Chevy, Ford 4V Mod Motor, Ford 3V Mod Motor, Chrysler Gen III Hemi, Viper SRT-10, and Small Block Chevy.

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 1.055 IN / Bottom 1.290 IN

Inner Diameter – Outer Valve Spring    
Top 0.650 IN / Bottom 0.885 IN

Installed Height    
1.800 IN

Installed Load    
130 PS

Installed Load / Height (Valve Closed)    
130 LB @ 1.800 IN

Open Load    
318 PS

Open Load / Height (Valve Open)    
318 LB @ 1.200 IN

Valve Spring Rate    
313 PS

Max Coil Bind    
1.140 IN

Max Valve Lift    
0.600 IN

Recommended Valve Spring Retainer – 300 Series    
R310, R311, R363

Recommended Valve Spring Retainer – 500 Series    
R510, R511

Recommended Valve Spring Seat    
S111

Valve Spring Series    
RPM Series

Valve Spring Type    
Ovate Wire Beehive

Primary Market    
Circle Track|Street Performance