1939 Engine Question?

Posted by Bob J On 2022/12/16 10:56:59

I was looking at the listing of cars/parts available and one is this 1939 engine in Texas. I am wondering what the opening in the exhaust manifold is right beside the carb perch? Just curious as I have not seen anything like that on an engine before.
Thanks,
Bob J.

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  39 Packard engine.jpg (78.99 KB)