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Re: What are these and what for?
While I don't doubt they -can- be used as a drain plug, I do have some doubts about that being their reason for existing. I'd still like to know the rationale for GM including them in early castings, and why they went away eventually...
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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