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Q.#1...If an oil priming rod is used after a re-build and ran clockwise rather than counter-clockwise (like a 383 should), could the new oil pump be damaged?

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Not likely, but certainly possible. Most pumps are shipped dry, with only a light coating of rust inhibitor, which is not a lubricant. If it was installed without dumping some oil in it, or better yet, dis-assembled and filled with assembly lube, running it backwards (dry) could possibly gall the end plate or rotors. So while I would think it would take several minutes to cause damage, you asked if damage was POSSIBLE- yes, it is.