Additional information
Outer Diameter (Bottom): 1.083 in
Inner Diameter (Bottom): 0.999 in
Outer Diameter (Top): 0.720 in
Inner Diameter (Top): 0.636 in
Installed Height (Valve Closed): 1.575 in
Seat Pressure @ 1.575 in: 120 lbs
Open Pressure @ 1.025 in: 280 lbs
Spring Rate: 291 lb/in
Coil Bind Height: 0.952 in
Max Valve Lift: 0.550 in
Recommended components:
Retainers: N/A
Application notes:
Ford 5.4L GT500 and Cobra Jet high-lift exhaust spring. Fits stock retainers and seats.
racingsprings.com
Vendor Part Number: PAC-1231X
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