What’s the “H” for on 915 heads?

cudamark said

My understanding is that the letter suffix indicates the year of the casting. H being 1972.....like the engine year codes.

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Thanks. Oddly enough the other head the previous owner marked “drivers side” is letter C and the 360 script is very small and looks like cursive writing.

I’m laughing because the heads on my 340 in my 72 Demon is the same way. One letter “H” and one letter “C” those heads are 2.02 / 1.60 heads as well.

Maybe drilled for alternator bracket - not sure. I’m positive someone will chime in.