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I am getting ready to have an engine rebuilt for my 42' 120

The original block was bad so I am using one from 1945.

The question is, all three heads I have are cast iron 282 heads and they are all marked HC Packard 282.

They all have the part numbers cast in the top near the front edge just in front of the water outlet.

Two of them have part number 387835 and one has part number 367635 - Maybe different years?

None of the parts book list either of these numbers all the way from 1935 to 1947

They have the parts numbers just above and below these.

The parts book list 367636 as the correct head for all 42' 8 cylinder 282's

Anyone have any idea's as to why they are not listed?

Best guess to what one to use? They all look exactly the same.

Thanks, Jerry

The numbers you're looking at on the head are casting form numbers, not part numbers. A single casting could produce several different finished parts by differences in post-casting machining operations, for example an HC and a regular compression head. That's why the part numbers themselves are a few digits one side or the other of the casting number. Same logic applies to certain forgings.

That makes sense - thanks for the insight on the casting numbers