Additional information
Outer Diameter: 1.550 in
Outer Inner Diameter: 1.100 in
Middle Inner Diameter: N/A
Inner Diameter: 0.788 in
Installed Height (Valve Closed): 2.000 in
Seat Pressure @ 2.000 in: 275 lbs
Open Pressure @ 1.200 in: 805 lbs
Spring Rate: 663 lb/in
Max Valve Lift: 0.800 in
Coil Bind Height: 1.150 in
Recommended components:
Retainers (PAC 500 Series): R506, R541
Retainers (PAC 600 Series): R606, R641, R661
Spring Seats: S105, S106, S139
Application notes:
Smaller diameter spring for bracket racing applications.
racingsprings.com
Vendor Part Number: PAC-1226
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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