Toyota Supra / BMW B58B30 Ferrea exhaust valve STD F2430P

Springs data:
Seat pressure - 77lbs @ 40.10mm
Open (lift) pressure - 180lbs @ 10mm
Spring coil bind - 27.00mm
Rate - 10.30lbs/mm
Max lift - 12.20mm
Outer spring outer diameter: 26.50mm
Outer spring inner diameter: 18.70mm
Inner spring outer diameter: 21.60mm
Inner spring inner diameter: 13.80mm

Set includes:
Dual springs: 24 pcs. SPR-FE20BE
Titanium retainers: 12 pcs. RET-BMB48/TE and 12 pcs. RET-BMB48/TI

Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.