Steel flange (not stainless steel) for 12mm thick head (suitable to become 10mm after relative flattening and not like the classic ones that are on the market from 10 which becomes 8mm causing venting)
Compatible with Opel Astra S 1800 16v
Using this flange it is possible to build the manifold or at least to make jigs for particular applications.
Steel flange to make the exhaust manifold for Fiat - Alfa - Lancia 1.400 16v engines both aspirated and turbo like Fiat 500 Abarth for the construction of the exhaust manifold