BN6 - 2 SEATER. SU HD6 Carburettors. SU 1¾” HD6 Carburettors - AUC866. Austin Healey 100/6. NEEDLE VALVE. VZX1101 - LARGE BORE SPRING LOADED 0.096" VITON TIPPED NEEDLE VALVE. for use with one. To date, petrol in the UK has contained up to 5% renewable ethanol (known as E5).