4AG 1.6L - DOHC 16 Valve (ATLANTIC) Type/Material/Application: Single Spring - Special Alloy Outside Diameter: 23.5 mm Inside Diameter: 16.46 mm Seat Pressure: 40 lbs @ 35 mm Open Pressure: 120 lbs @ 25 mm Rate Inch: 203 lbs Coil Bind: 22 mm Max Net Lift: 12 mm This Spring requires Ferrea Titanium Retainer # E11046 and Factory supplied Spring Seat Locator.
4.5L - DOHC 24 Valve (1FZFE) Type/Material/Application: Single Spring - Special Alloy Outside Diameter: 28 mm Inside Diameter: 20.8 mm Seat Pressure: 67 lbs @ 31 mm Open Pressure: 150 lbs @ 21 mm Rate Inch: 210 lbs Coil Bind: 17 mm Max Net Lift: 13 mm This Spring requires OEM Steel Retainers and Ferrea Spring Seat Locator # SL1114 (Discard OEM Factory supplied Spring Seat Locator)
4.0L - V6 - DOHC 24 Valve (1GR - FE) Type/Material/Application: Single Spring - Special Alloy - Endurance Outside Diameter: 25.19 mm Inside Diameter: 18.30 mm Seat Pressure: 80 lbs @ 36 mm Open Pressure: 145 lbs @ 26 mm Rate Inch: 165 lbs Coil Bind: 21 mm Max Net Lift: 13 mm This Spring requires Ferrea Titanium Retainer # E11104 and OEM Spring Seat Locator
4AGELU 1.6L - DOHC 20 VALVE Type/Material/Application: Single Spring - Special Alloy Outside Diameter: 20.32 mm Inside Diameter: 14.23 mm Seat Pressure: 40 lbs @37 mm Open Pressure: 133 lbs @27 mm Rate Inch: 236 lbs Coil Bind: 25.15 mm Max Net Lift: 11 mm This Spring requires Ferrea Tool Steel Retainer # E20052, Ferrea Valve Locks #K10106 and Ferrea Spring Seat Locator #SL1133. (Discard OEM Factory Spring Seat Locator). TECH NOTE: Ferrea Pro Springs are designed with progressive wound coils. Assemble stacked coils of spring at the bottom, on top of spring seat locator.
SUPRA 3.0L - DOHC 24 VALVE (B58) TURBO Type/Material/Application: Single Spring - PAC Enhanced - Special Alloy Outside Diameter: 22.53 mm Inside Diameter: 15.52 mm Seat Pressure: 70 lbs @39 mm(INT) / 85 lbs @37.7 mm(EXH) Open Pressure: 175 lbs @29 mm(INT) / 185 lbs @27.7 mm(EXH) Rate Inch: 253 lbs Coil Bind: 26 mm Max Net Lift: 11.5 mm(INT) / 11 mm(EXH) This Spring requires BOTH Ferrea Titanium Retainers # E11146 (EXH) and # E11147 (INT) and BOTH Ferrea Hat Seat Locators # SL1175 (EXH) and # SL1176 (INT). (Discard OEM Spring Hat Seat Locator)
WARNING: DUE TO VALVETRAIN ASSEMBLY INSTALLED HEIGHTS, MAXIMUM VALVE NET LIFTS MUST NOT EXCEED THE RECOMMENDED AMOUNTS BECAUSE OF VALVE SEAL TO SPRING RETAINER CLEARANCES.
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