Then what you need to save your engine from a massive blow up (if the inlet manifold cracks inwards) are our new inlet manifolds.
It took us 12 hrs to repair these pair of inlet manifolds by cutting out patches, scraping & blasting, scraping & blasting again several times & finally welding the patches back in.
51688 DB2 Vantage to DB2/4 MkII Front Inlet manifold
51687 DB2 Vantage to DB2/4 MkII Rear Inlet manifold
52917 DB MkIII Twin Carb DBA engine Front & Rear Inlet manifolds