Might be a return port for an external oil filter/cooler ? Just a large plug in the engines I find on line.
Well, this is in a different location on the block...
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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