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APPLICATION & PURPOSE

When installing aftermarket valve springs in a head assembly, the amount of load applied to each spring need to be adjusted until everything is in uniform specification. This is a standard procedure which all race engines go through in order to be able to raise the engine RPM without any glitches or hesitation. The standard method involved when putting together the valve assembly is to fully balance all the added components to tighter clearances than the manufacturer specifications. This method called “blueprinting” can be time consuming and a very costly service performed by an experienced engine builder. By utilizing the various thickness of the spring seats to adjust to each and different spring rate load, the same objective can be satisfied with fraction of the cost. All of Tomei Powered’s complete race engines are fitted and tuned with these valve spring seats to ensure uniform specification for all areas that are necessary.

EFFECTS WITHOUT SPRING LOAD ADJUSTMENTS.

*Initially the valve springs begin to surge, becoming very sticky under loads. This leads to ample power loss but in worst case scenarios, the cotter pin may disengage from its assembly applying major damage to the engine.

EXAMPLE

When installing Tomei Type A valve springs in an RB26 and performing a three angle valve job, the stock spring load spec of 24kg is decreased to less than 20kg. By installing the Tomei Valve Spring Seats, the spring load can be brought back to tolerance to the 24kg range, enabling the engine to rev freely once again.



VALVE SPRING SEAT

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VALVE SPRING SEATS 4G63/EJ205/EJ207/EJ255/EJ257 0.2mm 8pcs

  • Parts No.TA305A-MT01A
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock8
  • EngineMITSUBISHI 4G63, SUBARU EJ205, SUBARU EJ207, SUBARU EJ255, SUBARU EJ257
  • NoteIn Stock Now!
  • ModelMITSUBISHI EVO1-9, SUBARU WRX, SUBARU WRX STI
  • Available Repair PartsNo
  • Parts No.TA305A-MT01A
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineMITSUBISHI 4G63, SUBARU EJ205, SUBARU EJ207, SUBARU EJ255, SUBARU EJ257
  • ModelMITSUBISHI EVO1-9, SUBARU WRX, SUBARU WRX STI
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock8
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS 4G63/EJ205/EJ207/EJ255/EJ257 0.3mm 8pcs

  • Parts No.TA305A-MT01B
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock6
  • EngineMITSUBISHI 4G63, SUBARU EJ205, SUBARU EJ207, SUBARU EJ255, SUBARU EJ257
  • NoteIn Stock Now!
  • ModelMITSUBISHI EVO1-9, SUBARU WRX, SUBARU WRX STI
  • Available Repair PartsNo
  • Parts No.TA305A-MT01B
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineMITSUBISHI 4G63, SUBARU EJ205, SUBARU EJ207, SUBARU EJ255, SUBARU EJ257
  • ModelMITSUBISHI EVO1-9, SUBARU WRX, SUBARU WRX STI
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock6
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS 4G63/EJ205/EJ207/EJ255/EJ257 0.5mm 8pcs

  • Parts No.TA305A-MT01C
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock8
  • EngineMITSUBISHI 4G63, SUBARU EJ205, SUBARU EJ207, SUBARU EJ255, SUBARU EJ257
  • NoteIn Stock Now!
  • ModelMITSUBISHI EVO1-9, SUBARU WRX, SUBARU WRX STI
  • Available Repair PartsNo
  • Parts No.TA305A-MT01C
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineMITSUBISHI 4G63, SUBARU EJ205, SUBARU EJ207, SUBARU EJ255, SUBARU EJ257
  • ModelMITSUBISHI EVO1-9, SUBARU WRX, SUBARU WRX STI
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock8
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS RB SERIES 0.2mm 8pcs

  • Parts No.TA305A-NS05A
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock9
  • EngineNISSAN RB25DE, NISSAN RB25DET, NISSAN RB20DE, NISSAN RB20DET
  • NoteIn Stock Now!
  • ModelNISSAN 32 SKYLINE, NISSAN 33 SKYLINE, NISSAN 34 SKYLINE
  • Available Repair PartsNo
  • Parts No.TA305A-NS05A
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineNISSAN RB25DE, NISSAN RB25DET, NISSAN RB20DE, NISSAN RB20DET
  • ModelNISSAN 32 SKYLINE, NISSAN 33 SKYLINE, NISSAN 34 SKYLINE
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock9
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS RB SERIES 0.3mm 8pcs

  • Parts No.TA305A-NS05B
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock4
  • EngineNISSAN RB25DE, NISSAN RB25DET, NISSAN RB20DE, NISSAN RB20DET
  • NoteIn Stock Now!
  • ModelNISSAN 32 SKYLINE, NISSAN 33 SKYLINE, NISSAN 34 SKYLINE
  • Available Repair PartsNo
  • Parts No.TA305A-NS05B
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineNISSAN RB25DE, NISSAN RB25DET, NISSAN RB20DE, NISSAN RB20DET
  • ModelNISSAN 32 SKYLINE, NISSAN 33 SKYLINE, NISSAN 34 SKYLINE
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock4
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS RB SERIES 0.5mm 8pcs

  • Parts No.TA305A-NS05C
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock8
  • EngineNISSAN RB25DE, NISSAN RB25DET, NISSAN RB20DE, NISSAN RB20DET
  • NoteIn Stock Now!
  • ModelNISSAN 32 SKYLINE, NISSAN 33 SKYLINE, NISSAN 34 SKYLINE
  • Available Repair PartsNo
  • Parts No.TA305A-NS05C
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineNISSAN RB25DE, NISSAN RB25DET, NISSAN RB20DE, NISSAN RB20DET
  • ModelNISSAN 32 SKYLINE, NISSAN 33 SKYLINE, NISSAN 34 SKYLINE
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock8
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS SR SERIES 0.2mm 8pcs

  • Parts No.TA305A-NS08A
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock12
  • EngineNISSAN SR20DE, NISSAN SR20DET
  • NoteIn Stock Now!
  • ModelNISSAN 13 SILVIA, NISSAN 14 SILVIA, NISSAN 15 SILVIA, NISSAN 180SX
  • Available Repair PartsNo
  • Parts No.TA305A-NS08A
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineNISSAN SR20DE, NISSAN SR20DET
  • ModelNISSAN 13 SILVIA, NISSAN 14 SILVIA, NISSAN 15 SILVIA, NISSAN 180SX
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock12
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS SR SERIES 0.3mm 8pcs

  • Parts No.TA305A-NS08B
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock7
  • EngineNISSAN SR20DE, NISSAN SR20DET
  • NoteIn Stock Now!
  • ModelNISSAN 13 SILVIA, NISSAN 14 SILVIA, NISSAN 15 SILVIA, NISSAN 180SX
  • Available Repair PartsNo
  • Parts No.TA305A-NS08B
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineNISSAN SR20DE, NISSAN SR20DET
  • ModelNISSAN 13 SILVIA, NISSAN 14 SILVIA, NISSAN 15 SILVIA, NISSAN 180SX
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock7
  • NoteIn Stock Now!
  • Available Repair PartsNo
VALVE SPRING SEATS SR SERIES 0.5mm 8pcs

  • Parts No.TA305A-NS08C
  • Weight1 lbs
  • MSRP$11.00
  • Dimension7 x 7 x 4 inch
  • Sub CategoryVALVE SPRING SEAT
  • Qty in Stock8
  • EngineNISSAN SR20DE, NISSAN SR20DET
  • NoteIn Stock Now!
  • ModelNISSAN 13 SILVIA, NISSAN 14 SILVIA, NISSAN 15 SILVIA, NISSAN 180SX
  • Available Repair PartsNo
  • Parts No.TA305A-NS08C
  • MSRP$11.00
  • Sub CategoryVALVE SPRING SEAT
  • EngineNISSAN SR20DE, NISSAN SR20DET
  • ModelNISSAN 13 SILVIA, NISSAN 14 SILVIA, NISSAN 15 SILVIA, NISSAN 180SX
  • Weight1 lbs
  • Dimension7 x 7 x 4 inch
  • Qty in Stock8
  • NoteIn Stock Now!
  • Available Repair PartsNo
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