One of the most overlooked engine parts when upgrading a turbo in your 7.3L Powerstroke is the valve springs. The added cylinder pressure from upgraded turbos can cause valve float under higher RPM conditions. This can cause a loss of power and overall efficiency issues. The CNC Fabrication Stage 1 Valve Springs are designed for trucks up to 500 horsepower and feature a 119lb seat load and are a great mild upgrade over the stock valve springs.