We specialise in A-series Twin Kam conversions and A-Series 7-Port billet cylinder heads. We produced the first commercially available conversion kit and sell all the parts that you'll need to fit a BMW 'K' 8V or 16V cylinder head to your A-series engine. From our comprehensive Twin Kam build guide to a turn-key built engine producing over 250bhp, Specialist Components is your one-stop solution. We also offer a comprehensive engine machining and assembly service for all aspects of A-series engine builds.