FERREA S10177 Valve Spring for TOYOTA GR Supra (A90 / A91)

Description FERREA S10177 Valve Spring for TOYOTA GR Supra (A90 / A91)

The FERREA S10177 valve spring set is engineered for the 3.0L DOHC 24-valve B58 turbo engine used in the Toyota GR Supra (A90/A91). Designed as a PAC-enhanced single spring made from a special alloy, it provides the required seat and open pressures for upgraded valvetrain stability under increased boost and high-RPM operation. The spring specification supports both intake and exhaust sides with defined lift limits to ensure proper clearance to valve seals and retainers.

• PAC-enhanced single spring construction using a special alloy
• Engineered for B58 valvetrain stability under high load
• Defined seat and open pressures for intake and exhaust positions
• Compatible only with Ferrea titanium retainers and Ferrea hat seat locators
• Designed with strict maximum lift limits to maintain retainer-to-seal clearance

Specifications:

• 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)
• Required Components: Ferrea Titanium Retainers E11146 (EXH) & E11147 (INT)
• Required Components: Ferrea Hat Seat Locators SL1175 (EXH) & SL1176 (INT)