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I was replacing the air filters today on my car and above the left air intake trumpet on the Dellorto carbs there is a large hole 1.5cm. Does anyone know its purpose? It doesn't seem to be part of the main air path. Thanks

Hi guys, I have just finished fitting my Dellorto 40s to my 8v 1.9 for the third time! The first time I discovered the carb manifold was warped and that water from the holes in the block was leaking in, causing loads of white smoke from the exhaust. The second time I acquired a new manifold and plugged the water holes with silicone prior to fitting, but is still managed to find a route through resulting in more white smoke and bemused neighbours. Tonight I got the set up sorted but I still have the same problem. I'm sure there's no water from the block getting through but I'm still getting loads of white smoke. The oil in the sump is now just a creamy emulsion and the water in the header tank is frothy and smells of oil. My question is, is this a result of so much water being dragged through the engine or should I've looking at the cylinder head gasket? Or perhaps something else I've missed converting to carbs? Any help greatly appreciated before I rip the whole lot apart again!