Naturally Aspirated racing engines with increased compression, mildly ported cylinder head and well designed intake and exhaust system. More top end power than the 194-B cam, pulling to around 9-9.5k rpm depending on engine. Great for circuit racing or rally with close ratio gearbox. Kelford recommends VVT delete on intake, using adjustable gears for fixed timing. Kelford Cams recommends KVS51-B valve springs.