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. VVL will pull to around 10k+ rpm. Kelford Cams recommend KVS10-BT valve spring kit. Primary lobe spec: Intake: 272°/10.2mm | Exhaust: 254°/10.2mm