Alloy inlet manifold to fit Weber 32/34 32/36 DGAV or 38 DGAS style carb to the Vauxhall 1.8 Z18XE engine as fitted in Vectra and Astra models with head casting number 90411781. Casting has generous sized ports for std or modified engines and is suitably strong for racing use with 10mm head flange. There is provision for vac ports if required for servo or map sensor etc. Bosses cast in to support linkage. Manifold is designed for fwd and is 61/2"" ( 165mm ) wide. Thick runner walls to allow further porting if required/allowed. Accepts all std gaskets and studs etc