Welcome Guest   Log InView Cart

ENDURANCE PLUS & SP Valve Springs

SP Springs - High Endurance The "SP" series utilizes "Hi-Tensile" Chrome Silicon outer spring material. For applications with radical cams and/or moderately high rpm, where traditional chrome silicon springs prove inadequate, the "SP" series is the next highest level of endurance. All "SP" series springs are Spintron Test-Proven up to 8000 rpm for 700 racing miles. PLUS Springs - Endurance Plus The Endurance Plus series of valve springs utilizes a specially processed Tool Room Material outer spring for increased endurance/reliability beyond the "SP" series. Endurance Plus springs are designed for late models, modifieds, etc., and are Spintron Test-Proven up to 8400 rpm for 850 racing miles.


Model Product Image Item Name Price
8205PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.530/1.110 Inner OD/ID: 1.005/.730 Seat Pressure: 150 Lbs @1.900 Open Pressure: 420 Lbs @1.300 Rate Per Inch: 440...
$315.00

View More

8005PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.530/1.110 Inner OD/ID: 1.005/.730 Seat Pressure: 140 Lbs @1.875 Open Pressure: 400 Lbs @1.275 Rate Per Inch: 420...
$315.00

View More

9005PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.530/1.110 Inner OD/ID: 1.005/.725 Seat Pressure: 170 Lbs @1.900 Open Pressure: 455 Lbs @1.300 Rate Per Inch: 455...
$315.00

View More

9365PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.560/1.145 Inner OD/ID: 1.040/.740 Seat Pressure: 235 Lbs @1.950 Open Pressure: 560 Lbs @1.270 Rate Per Inch: 470...
$315.00

View More

937585PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.560/1.145 Inner OD/ID: 1.040/.740 Seat Pressure: 250 Lbs @1.970 Open Pressure: 580 Lbs @1.290 Rate Per Inch: 470...
$315.00

View More

9375PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.560/1.145 Inner OD/ID: 1.040/.740 Seat Pressure: 230 Lbs @1.970 Open Pressure: 560 Lbs @1.290 Rate Per Inch: 480...
$315.00

View More

9385PLUS Endurance Plus Valve Springs

Endurance Plus Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.560/1.145 Inner OD/ID: 1.040/.740 Seat Pressure: 245 Lbs @2.000 Open Pressure: 600 Lbs @1.280 Rate Per Inch: 500...
$315.00

View More

6105SP SP (Special Processing) Valve Springs

SP (Special Processing) Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.440/1.083 Inner OD/ID: .985/.730 Seat Pressure: 145 lbs @1.800 Open Pressure: 365 lbs @1.175 Rate Per Inch: 360...
$268.00

View More

8005SP SP (Special Processing) Valve Springs

SP (Special Processing) Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.530/1.110 Inner OD/ID: 1.005/.730 Seat Pressure: 150 lbs @1.875 Open Pressure: 435 lbs @1.225 Rate Per Inch: 415...
$224.00

View More

8205SP SP (Special Processing) Valve Springs

SP (Special Processing) Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.530/1.110 Inner OD/ID: 1.005/.730 Seat Pressure: 150 Lbs @1.900 Open Pressure: 440 Lbs @1.300 Rate Per Inch: 440...
$224.00

View More