HEMI head casting number help

A friend of mine has a set of HEMI heads with casting number 2780559 on one and 278055 on the other. I've looked in the MP Bible but they don't seem to have the casting numbers with the years they were made.

Does ANYONE know what year heads these are and if they are anything special? Yeah, I know, all HEMI stuff is special - AMEN? AMEN.

Thanks, Rev. Mopar Racewthrev@aol.com

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A friend of mine has a set of HEMI heads with casting number 2780559 on one and 278055 on the other. I've looked in the MP Bible but they don't seem to have the casting numbers with the years they were made.

Does ANYONE know what year heads these are and if they are anything special? Yeah, I know, all HEMI stuff is special - AMEN? AMEN.

Thanks, Rev. Mopar Racewthrev@aol.com

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The 2780559 is a 66-71 production head according to Galen's White book.
The other number is short one digit, I'm guessing it's a 9 and it's the same part number head.