Ford Barra 4.0L Stage 2 Valve Spring & Titanium Retainer Set
This Stage 2 valve spring & titanium retainer set suits all BA/BF and FG Ford DOHC 6 cylinder Barra 4.0L engines. These springs/retainers are suitable for applications from 460rwkw upwards.
These springs are highly recommended for applications over 460rwkw (600hp), to help eliminate valve float. Valve float causes damage to valve stem seals and collets / retainers. Once installed, a much more powerful and free revving top end power curve is possible. OEM valve springs have approx 50 psi seat pressure, once 15 psi is added to this equation (which acts against the valve spring), approximately only 35 psi seat pressure is left. This is nowhere near enough to keep the valves shut at high rpms.
These Springs are an OVATE wire, which are a Gas Nitride treated Beehive style spring. These springs are spec’d to 105Lbs at 1.470 fitted height, and 245Lbs at .530 lift.
The Titanium retainers are designed to suit “BEE-HIVE” style valve springs, and are a must for improved reliability and longevity.
Direct replacement, and a must if using camshafts with high RPM, high boost pressure setups.