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PAC Racing RPM Series Dual Valve Spring Set – GM Gen III/IV LS – Solid Roller

0.630 in. ID – 1.274 in. OD – 1.800 in. installed Height – 0.750 in. Max Valve Lift


Your Price: $499.59

SKU: PAC-1238X-16

In Stock

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PAC Racing’s RPM Series Dual 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. These springs fit GM Gen III/IV LS engines with specific part numbers for stock heads and aftermarket heads.

  • 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
SKU: PAC-1238X-16 Categories: , , , ,

GTIN: 00193564531803

Outer Diameter – Outer Valve Spring

1.274 IN
Inner Diameter – Outer Valve Spring

0.900 IN
Inner Diameter – Inner Valve Spring

0.630 IN
Installed Height

1.800 IN
Installed Load / Height (Valve Closed)

250 LB @ 1.800 IN
Open Height

1.050 IN
Open Load

700 PS
Open Load / Height (Valve Open)

700 LB @ 1.050 IN
Valve Spring Rate

600 PS
Max Coil Bind

0.985 IN
Max Valve Lift

0.750 IN
Recommended Valve Spring Retainer – 400 Series

R432
Recommended Valve Spring Retainer – 500 Series

R532
Recommended Valve Spring Retainer – 600 Series

R632
Recommended Valve Spring Seat

S128, S138
Valve Spring Series

RPM Series
Valve Spring Type

Dual
Primary Market

Drag Race|Street Performance