Additional information
Outer Diameter (OD): 1.625 in
Spring ID (Outer): 1.175 in
Inner Diameter (ID): 0.851 in
Installed Height (Valve Closed): 2.100 in
Seat Pressure @ 2.100 in: 280 lbs
Open Pressure @ 1.150 in: 847 lbs
Spring Rate: 629 lb/in
Coil Bind Height: 1.100 in
Max Valve Lift: 0.950 in
Recommended components:
Retainers (PAC 400 Series): R404
Retainers (PAC 500 Series): R504
Spring Seats: S101, S102
Application notes:
Bracket racing and high-lift applications.
racingsprings.com
Vendor Part Number: PAC-1328
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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