Supertech SPRK-H1020D/SR20 Dual Valve Springs Kit SR20DET 275 lbs Image1
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Supertech Dual Valve Springs Kit SR20DET 275 lbs

  • Chrome Silicon Vanadium

  • Computer designed

  • High durability

Supertech SPRK-H1020D/SR20 Dual Valve Springs Kit SR20DET 275 lbs
List Price: $605.48
$484.38  Save 20%
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Product Details

​Supertech valve springs are computer designed to ensure smooth harmonics under high RPM and load. The stress levels are kept under control and fatigue is reduced for long durability under extreme conditions. These springs are made of premium Superclean Chrome Silicon Vanadium steel alloy, which is a tough alloy that was designed for higher performance and durability at high RPM's and memory retention.


  • Outer Spring O.D.: 30.00mm
  • Outer Spring I.D.: 21.80mm
  • Inner Spring O.D.: 21.30mm
  • Inner Spring I.D.: 15.50mm
  • Seat: 116 @ 40.5 ([email protected])
  • Open (lift): 275 @ 12.0 ([email protected])
  • Max net lift: 15.00mm
  • Coil bind: 25.50mm
  • Rate: 13.20 lbs/mm

Retainer P/N: RET-NSR20/T1 (16) + SEAT-SR20/6 (8 for Intake) + SEAT-H/N240 (8 for Exhaust)

Note: This is for a complete set of dual intake and exhaust valve springs. Retainers and spring seats are included if they are part of the kit.

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Vehicle Applications

Years Make Model Trim Chassis Engine Notes
1989 - 1998 Nissan 180SX   (S13) SR20DE  
1989 - 1998 Nissan 180SX   (S13) SR20DET  
1994 - 1998 Nissan 200SX (Non-US)   (S14) SR20DET  
2000 - 2002 Nissan 200SX (Non-US)   (S15) SR20DET  
1989 - 1993 Nissan Silvia   (S13) SR20DE  
1989 - 1993 Nissan Silvia   (S13) SR20DET  
1994 - 1998 Nissan Silvia   (S14) SR20DE  
1994 - 1998 Nissan Silvia   (S14) SR20DET  
1999 - 2002 Nissan Silvia   (S15) SR20DE  
1999 - 2002 Nissan Silvia   (S15) SR20DET  
ALL - ALL Nissan 240SX        
ALL - ALL Nissan 180SX        
ALL - ALL Nissan SILVIA        
ALL - ALL Nissan 200SX (NON-US)