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Re: What are these and what for?
I still think they were a foundry thing, not an automotive thing. Maybe they got better shaker tables to get the sand out and found they didn't need to use them anymore? Really wish I knew though.
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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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