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PAC Racing - PAC-1238X - 1.274 Dual Valve Springs GM LS (16)

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Product description

Valve Spring - RPM Series - Dual Spring - 600 lb/in Spring Rate - 0.985 in Coil Bind - 1.274 in OD - GM LS-Series - Set of 16

Additional information
Outer Diameter: 1.274 in
Inner Diameter (Outer): 0.900 in
Inner Diameter (Inner): 0.630 in
Installed Height (Valve Closed): 1.800 in
Seat Pressure @ 1.800 in: 250 lbs
Open Pressure @ 1.050 in: 700 lbs
Spring Rate: 600 lb/in
Max Valve Lift: 0.750 in
Coil Bind Height: 0.985 in

Recommended components:
Retainers (PAC 400 Series): R432
Retainers (PAC 500 Series): R532
Retainers (PAC 600 Series): R632
Spring Seats: S128, S138

Application notes:
LS spring for drag racing and street/strip use. Very high rate and high frequency spring.

racingsprings.com

Vendor Part Number: PAC-1238X

Pac Racing Catalog -24
Pac Racing Catalog -15

Always verify specifications with the manufacturer and engine builder before final assembly.

The approximate size of the packed product or the sales package is 102 x 89 x 388 mm.

Engine
Chevy LS

Spring Type
Dual

Weight
1,7 kg(The product may have a light retail packaging.)

Availability
The product is currently not in stock at our warehouse. Available from our supplier. Estimated arrival at our warehouse 7 - 15 days from order, at the earliest 16.9.2026.

Delivery time?

If the product is available at the Vantaa warehouse, it can be picked up or delivered—usually already within the same day.

When the product shows an estimated delivery time of 7–15 days, this is how the supplier‑warehouse order progresses.

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