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[georgieb51]

Originally Posted by Grumpy old man

That part # comes back to a 1963-1965 Chevy Impala 230 6 cyl Lower Thermostat Housing OEM 3789160 It seems there are multiple applications .

https://southeastchevyparts-com.3dca...60_p_2385.html

https://picclick.com/1960s-Genuine-T...023513030.html

1960s Genuine Truck GMC GM Lower Thermostat Housing Rare Old Part 3789160 Rare

Thanks Grumpy. This is getting interesting. It makes me wonder why this part came with the engine. And it also makes me wonder if the engine is original to this truck. Time will tell. The guy who did this engine work is dead so I cannot ask about it. You are a good help.