Additional information
Outer Diameter (Bottom): 1.250 in
Inner Diameter (Bottom): 1.085 in
Outer Diameter (Top): 0.845 in
Inner Diameter (Top): 0.680 in
Installed Height (Valve Closed): 1.750 in
Seat Pressure @ 1.750 in: 110 lbs
Open Pressure @ 1.150 in: 328 lbs
Spring Rate: 363 lb/in
Coil Bind Height: 1.080 in
Max Valve Lift: 0.600 in
Recommended components:
Retainers (PAC 300 Series): R310, R311, R362, R363
Retainers (PAC 500 Series): R510, R511
Application notes:
Viper SRT-10 drop-in valve spring. Fits stock retainers and seats.
racingsprings.com
Vendor Part Number: PAC-1283
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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Check also: leveringsbetingelser