Tools & Fabrication - Drilling SBC Head ?s.

I need to drill and tap a hole in the passenger side head towards the intake. Is there anything I need to be concerned about, and how do I keep it from leaking?

Thanks.

dont go in more than needed and just check to make sure no water jwackets run there. -tony-

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the drilling sbc head sits above the cylinders and consists of a platform containing part of the combustion chamber and the location of the valves and spark plugs. In a flathead engine, the mechanical parts of the valve train are all contained within the block.