Positive Valve Stem Seals

Maximises oil control with Negative Supercharging

Negative Pressure Supercharging produces such a powerful vacuum, it pulls a large volume of oil past the valve stem guides over a short period of time with umbrella, teflon rubber or full teflon type valve stem seals. Therefore, the Negative Supercharging Kits and Impulse Crate Engines MUST use our all rubber 2-ring type positive seals to maximise oil control with Negative Pressure Supercharging and prevent an excessive amount of oil from being pulled into the cylinder.