Additional information
Outer Diameter: 1.430 in
Inner Diameter (Outer): 1.002 in
Inner Diameter: 0.688 in
Installed Height (Valve Closed): 2.100 in
Seat Pressure @ 2.100 in: 250 lbs
Open Pressure @ 1.200 in: 765 lbs
Spring Rate: 670 lb/in
Max Valve Lift: 0.900 in
Coil Bind Height: 1.152 in
Recommended components:
Retainers: R659
Spring Seats: S137X
Application notes:
Small diameter endurance spring. Must use special retainer.
racingsprings.com
Vendor Part Number: PAC-1373
Pac Racing Catalog -24
Pac Racing Catalog -15
Always verify specifications with the manufacturer and engine builder before final assembly.
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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