“R” SERIES EXTREME ENDURANCE VALVE SPRINGS
Boxed and sent as PAC-1392R's but specs are slightly different than listed.
Tested in our Performance Wholesale Race workshop on a Power Tech Compu-Spring tester. Revised spec sheet - see Compu-Spring Printout
Actual spring specs 205 @ 2.060, 710 @ 1.260. Average 627lb rate.
Pac have the 1392R's rated at 185 @2.060, 730 @ 1.260, 675 rate.
Choose carefully as clearance items are not returnable for exchange or credit.
Springs are brand new.
- Name: R” SERIES EXTREME ENDURANCE VALVE SPRINGS
- Description: Small Diameter Dual-Short Track
- Outside Diameter: 1.314"
- Outer Spring ID: 0.900"
- Middle Spring ID: N/A
- Damper: No
- Inner Spring ID: 0.616"
- Install Height: 2.060"
- Load at Installed Height: 205
- Spring Open Height: 1.260"
- Spring Open Load: 710
- Recommended Valve Lift: 0.800"
- Spring Rate (lbs/in): 627
- Coil Bind (max): 1.190"