The new Ferrea Valve Springs are processed with premium-grade alloy and feature special thermal treatment. Ferrea's advanced spring design and material specs have uniform load and stress distribution even in the most extreme racing conditions. Great for high revving applications. These valve springs and retainers will reliably allow your engine to rev high without the worry of part failure, valve float, or coil bind. Aftermarket valve springs are made out of superior metal alloy's and optimized spring rates to make sure your valvetrain can keep up with your cams at high rpm. Whether you are rebuilding your engine, or building an all out race engine, replacing your valvetrain with Ferrea components will allow you to rev higher, and go more aggressive on your cams.  

Single Springs -  S10177 Qty 24
Titanium Retainer (Exhaust Side) - E11146 Qty 12
Titanium Retainer (Intake Side) - E11147 Qty 12
Seat Locator (Exhaust Side) - SL1175 Qty 12
Seat Locator (Intake Side) - SL1176 Qty 12
* Use New OEM Valve Locks *

Ferrea springs are heat-treated and stress relieved, which dramatically increases the spring’s life. Ferrea valve springs provide the stability needed for high lift, high rpm racing engines, while minimizing the load loss for today’s aggressive valvetrain combinations.

Ferrea takes great pride in offering premium quality Spring Seat Locators. Fully CNC machining in-house from 4140 Chromoly Alloy for different applications. Each piece is crafted to exact tolerances OD & ID specs and insure flat, parallel spring pad to the bottom surface. Heat treatment consists of a Hard Nitrided Surface for unmatched toughness and anti-wear characteristics.

Make    Toyota / BMW
Model    Supra MKV A90 / BMW B58 Gen 2
Engine    B58B30M1
Inner Spring ID    15.52mm
Outer Spring OD    22.53mm
Open Pressure    175lbs @ 29mm / 185lbs @ 27.7mm
Max Lift    11.5mm/11mm
Coil Bind   26mm
Brand    Ferrea
Valve Spring Type    Single
Seat Pressure    70lbs @ 39mm / 85lbs @ 37.7mm
Valve Spring Rate    253lbs
Retainer Material    Titanium