Naturally aspirated track and drag racing cams to suit professionally built engines running on race fuel. Great with stroker kits and ITB intake. Ideal in a lightweight car with close ratio gears. Not for street cars. Cams will pull to around 10k+ rpm. Centre lobe removed, large lobe profile on outer lobes to allow for VVL system to be removed for less valvetrain mass. Kelford Cams recommend KVS10-BT valve spring kit.