Hello. In the picture, see the cover with the slot-head screws, below the exhaust pipe and above the braided oil line? What is that cover / what's behind it? The Assembly Manual doesn't speak to it, that I can find. This is a 1951 216 straight-6.
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CoverPlateOnBlock215.jpg (211.54 KB, 290 downloads)

DJ
'51 Chevy 3104 1/2-ton 216