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SU Carburettor High Performance Manual and SU Needle profile chart Pack. Contains expert guidance on building and modifying SU Carburettors to suit high-performance applications for road or track. Includes a unique Needle reprofiling method and explains how to 'Jet' SU's for almost any application. Also includes SU Needle Profile Chart. Over 700 Needle profiles for the following categories of Needle: fixed for .090in .100in .125in and 3/16in diameter Jets. Spring loaded for .090in and .100in diameter Jets