Stock 273 4bbl intake question

cudamark said

I've had at least a dozen of them over the years and was always curious as to the official reason for their purpose. Am I correct in my assumption that they're all the C.A.P. version, or does someone have a different casting with that same feature?

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Yes what I found and posted is they are all the cap version also used on the D Dart and in industrial and marine applications. The hole being threaded for a bolt was for a mount bracket in an industrial application in a 273 or 318 in 1966 or 1967 engine.