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PSI uses state-of-the-art CNC equipment throughout the manufacturing process to ensure batch-to-batch consistency and valve springs that are held to the tightest tolerances in the industry. At PSI, all production processes are done in-house according to strict Quality Control procedures with each spring proudly made in the USA. All PSI springs are 100% load tested and set matched for the ultimate in customer convenience and satisfaction.
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PSI DR1247, Triple Valve Spring, OD 1.660, 750lb PSI PSI DR1247, Triple Valve Spring, OD 1.660, 750lb PSI

Triple Drag Spring 1.660" OD, 1.195" ID Outer, 0.630" ID Inner, 340lbs@2.070" seat pressure, 940lbs@1.270" Open Pressure

Regular Price: $22.50
PSI CT1225ML, Dual Valve Spring, OD 1.445in, 939lb PSI PSI CT1225ML, Dual Valve Spring, OD 1.445in, 939lb PSI

Dual Endurance Spring 1.445" OD, 1.060" ID Outer, 0.775" ID Inner, 140lbs@1.950" seat pressure, 435lbs@1.200" Open Pressure

Regular Price: $21.26
PSI CT1541ML, Dual Valve Spring, OD 1.510, 494lb PSI PSI CT1541ML, Dual Valve Spring, OD 1.510, 494lb PSI

Dual Circle Track 1.510" OD, 1.085" ID Outer, 0.790" ID Inner, 240lbs@2.030" seat pressure, 625lbs@1.250" Open Pressure

Regular Price: $37.50
PSI CT1571ML, Dual Valve Spring, OD 1.590, 590lb PSI PSI CT1571ML, Dual Valve Spring, OD 1.590, 590lb PSI

Dual Circle Track 1.590" OD, 1.060" ID Outer, 0.835" ID Inner, 248lbs@2.050" seat pressure, 640lbs@1.270" Open Pressure

Regular Price: $37.50
PSI CT1573ML, Dual Valve Spring, OD 4.550, 671lb PSI PSI CT1573ML, Dual Valve Spring, OD 4.550, 671lb PSI

Dual Circle Track 1.550" OD, 1.100" ID Outer, 0.775" ID Inner, 220lbs@2.030" seat pressure, 743lbs@1.250" Open Pressure

Regular Price: $37.50
PSI CT1574ML, Dual Valve Spring, OD 1.510, 625lb PSI PSI CT1574ML, Dual Valve Spring, OD 1.510, 625lb PSI

Dual Circle Track 1.510" OD, 1.085" ID Outer, 0.760" ID Inner, 180lbs@1.980" seat pressure, 680lbs@1.180" Open Pressure

Regular Price: $37.50
PSI CT1575ML-TCRE, Dual Valve Spring, OD 1.400, 559lb PSI PSI CT1575ML-TCRE, Dual Valve Spring, OD 1.400, 559lb PSI

Dual Circle Track 1.400" OD, 0.995" ID Outer, 0.700" ID Inner, 150lbs@2.00" seat pressure, 625lbs@1.150" Open Pressure

Regular Price: $41.50
PSI DR1248, Triple Valve Spring, OD 1.660, 744lb PSI PSI DR1248, Triple Valve Spring, OD 1.660, 744lb PSI

Triple Drag Spring 1.660" OD, 1.195" ID Outer, 0.870" ID Inner, 375lbs@2.100" seat pressure, 1045lbs@1.200" Open Pressure

Regular Price: $22.50
PSI DR1249ML, Triple Valve Spring, OD 1.660, 725lb PSI PSI DR1249ML, Triple Valve Spring, OD 1.660, 725lb PSI

Triple Drag Spring 1.660" OD, 1.195" ID Outer, 0.630" ID Inner, 385lbs@2.200" seat pressure, 1100lbs@1.200" Open Pressure

Regular Price: $33.76
PSI DR1253RML, Triple Valve Spring, OD 1.630, 724lb PSI PSI DR1253RML, Triple Valve Spring, OD 1.630, 724lb PSI

Triple Drag Spring 1.630" OD, 1.180" ID Outer, 0.870" ID Inner, 440lbs@2.200" seat pressure, 1200lbs@1.150" Open Pressure

Regular Price: $36.26
PSI DR1254RML, Dual Valve Spring, OD 1.520, 767lb PSI PSI DR1254RML, Dual Valve Spring, OD 1.520, 767lb PSI

Dual Drag Spring 1.520" OD, 1.070" ID Outer, 0.745" ID Inner, 350lbs@2.100" seat pressure, 1040lbs@1.200" Open Pressure

Regular Price: $31.26
PSI DR1255RML, Dual Valve Spring, OD 1.520, 725lb PSI PSI DR1255RML, Dual Valve Spring, OD 1.520, 725lb PSI

Dual Drag Spring 1.520" OD, 1.070" ID Outer, 0.745" ID Inner, 445lbs@2.200" seat pressure, 1170lbs@1.200" Open Pressure

Regular Price: $31.26
PSI DR1257RML, Dual Valve Spring, OD 1.070, 1000lb PSI PSI DR1257RML, Dual Valve Spring, OD 1.070, 1000lb PSI

Dual Drag Spring 1.570" OD, 1.070" ID Outer, 0.750" ID Inner, 410lbs@2.150" seat pressure, 1260lbs@1.300" Open Pressure

Regular Price: $31.26
PSI DR1261RML, Triple Valve Spring, OD 1.675, 767lb PSI PSI DR1261RML, Triple Valve Spring, OD 1.675, 767lb PSI

Triple Drag Spring 1.675" OD, 1.195" ID Outer, 0.630" ID Inner, 525lbs@2.300" seat pressure, 1330lbs@1.250" Open Pressure

Regular Price: $36.26
PSI DR1262RML, Triple Valve Spring, OD 1.710, 900lb PSI PSI DR1262RML, Triple Valve Spring, OD 1.710, 900lb PSI

Triple Drag Spring 1.710" OD, 1.210" ID Outer, 0.630" ID Inner, 515lbs@2.300" seat pressure, 1460lbs@1.250" Open Pressure

Regular Price: $37.50
PSI DR1263RML, Triple Valve Spring, OD 1.675, 809lb PSI PSI DR1263RML, Triple Valve Spring, OD 1.675, 809lb PSI

Triple Drag Spring 1.675" OD, 1.195" ID Outer, 0.630" ID Inner, 425lbs@2.400" seat pressure, 1355lbs@1.250" Open Pressure

Regular Price: $37.50
PSI LS1512ML, Dual Valve Spring, OD 1.275, 408lb PSI PSI LS1512ML, Dual Valve Spring, OD 1.275, 408lb PSI

Dual LS1/LS6 Spring 1.275" OD, 0.935" ID Outer, 0.665" ID Inner, 130lbs@1.800" seat pressure, 395lbs@1.150" Open Pressure

Regular Price: $22.50
PSI CT1242, Dual Valve Spring, OD 1.580in, 513lb PSI PSI CT1242, Dual Valve Spring, OD 1.580in, 513lb PSI

Dual Circle Track 1.580" OD, 1.060" ID Outer, 0.835" ID Inner, 248lbs@2.050" seat pressure, 640lbs@1.270" Open Pressure

Regular Price: $25.00
PSI CT1242D, Damper Valve Spring, OD 1.580in, 513lb PSI PSI CT1242D, Damper Valve Spring, OD 1.580in, 513lb PSI

Dual Circle Track 1.580" OD, 1.155" ID Outer, 0.755" ID Inner, 250lbs@2.050" seat pressure, 650lbs@1.270" Open Pressure

Regular Price: $25.00
PSI CT1542ML, Dual Valve Spring, OD 1.580, 513lb PSI PSI CT1542ML, Dual Valve Spring, OD 1.580, 513lb PSI

Dual Circle Track 1.580" OD, 1.160" ID Outer, 0.835" ID Inner, 248lbs@2.050" seat pressure, 640lbs@1.270" Open Pressure

Regular Price: $37.50
PSI LS1511ML, Beehive Valve Spring, OD 1.290, 380lb PSI PSI LS1511ML, Beehive Valve Spring, OD 1.290, 380lb PSI

Single Beehive LS1/LS6 Spring 1.290" OD, 0.630" ID Outer, 130lbs@1.800" seat pressure, 370lbs@1.175" Open Pressure

Regular Price: $13.00
PSI dual valve spring CT1540ML PSI CT1540ML, Dual Valve Spring, OD 1.500 Inch, 610 Lbs.

This series has all the benefits of the 1200's plus an additional nitriding operation. The nitriding process, which is also done in-house, increases the strength at the surface of the wire and at the same time causes a slight softening of the core material. This trade-off in hardness results in a gain in endurance for the Circle Track and Road Circuit teams who are limited by the onset of fatigue at the wire surface. Since Drag racers are not limited by endurance, the loss of core hardness does not make nitriding suitbale for their applications.

Regular Price: $37.50
PSI dual valve spring CT1574ML PSI CT1574ML-TC, Dual Valve Spring, OD 1.510 Inch, 680 Lbs.

This series has all the benefits of the 1200's plus an additional nitriding operation. The nitriding process, which is also done in-house, increases the strength at the surface of the wire and at the same time causes a slight softening of the core material. This trade-off in hardness results in a gain in endurance for the Circle Track and Road Circuit teams who are limited by the on-set of fatigue at the wire surface. Since Drag racers are not limited by endurance, the loss of core hardness does not make nitriding suitable for their applications

Regular Price: $43.50
PSI dual valve spring CT1575ML PSI CT1575ML Dual Valve Spring, OD 1.400 Inch, 625 Lbs

This series has all the benefits of the 1200's plus an additional nitriding operation. The nitriding process, which is also done in-house, increases the strength at the surface of the wire and at the same time causes a slight softening of the core material. This trade-off in hardness results in a gain in endurance for the Circle Track and Road Circuit teams who are limited by the on-set of fatigue at the wire surface. Since Drag racers are not limited by endurance, the loss of core hardness does not make nitriding suitable for their applications.

Regular Price: $37.50
PSI dual valve spring CT1539ML PSI CT1539ML, Dual Valve Spring, OD 1.500 Inch, 575 lbs.

This series has all the benefits of the 1200's plus an additional nitriding operation. The nitriding process, which is also done in-house, increases the strength at the surface of the wire and at the same time causes a slight softening of the core material. This trade-off in hardness results in a gain in endurance for the Circle Track and Road Circuit teams who are limited by the onset of fatigue at the wire surface. Since Drag racers are not limited by endurance, the loss of core hardness does not make nitriding suitbale for their applications.

Regular Price: $37.50
PSI dual valve spring CT1572ML PSI CT1572ML, Dual Valve Spring, 1.510 Inch, 650 Lbs.

This series has all the benefits of the 1200's plus an additional nitriding operation. The nitriding process, which is also done in-house, increases the strength at the surface of the wire and at the same time causes a slight softening of the core material. This trade-off in hardness results in a gain in endurance for the Circle Track and Road Circuit teams who are limited by the on-set of fatigue at the wire surface. Since Drag racers are not limited by endurance, the loss of core hardness does not make nitriding suitable for their applications.

Regular Price: $37.50
   
 
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