Circle Track Valve Springs
PAC offers three series of dual-spring valve spring assemblies for circle track racing applications. The economical 1200 series is standard HP-processed with good fatigue life. 1300 series Nano Peen springs have surface enhancements and full chamfering for extreme reliability. Premium 1500 series are polished, gold-colored Nano Peen springs engineered for extreme engine speeds and radical camshaft profiles. Sold in sets of 16.
- Valve Spring Style:
- Beehive
- Number of Springs Per Valve:
- Single
- O.D. Outer Spring (in.):
- 1.282 in./1.077 in.
- Coil Bind Height (in.):
- 1.181 in.
- Damper Spring Included:
- No
- Spring Rate (lbs/in.):
- 386 lbs./in.
- I.D. of Outer Spring (in.):
- 0.655 in./0.860 in.
- I.D. of Inner Spring (in.):
- N/A
- Valve Springs Coated:
- Yes
- Maximum Valve Lift (in.):
- 0.500 in.
- Retainers Included:
- No
- Retainer Material:
- N/A
- Locks Included:
- No
- Lock Material:
- N/A
- Valve Stem Seals Included:
- No
- Installed Height:
- 92 lbs. @ 1.800 in.
- Open Height:
- 285 lbs. @ 1.300 in.
- Quantity:
- Sold as a set of 16.
- Notes:
- 604 crate motor blue ovate wire spring.
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen I
- Engine Sizes:
- 4.3L/262-6.6L/400
- Years:
- 1955-2002
