My Head Hurts / 1600 and 1725 Head Casting Numbers

[Thomas Wiencek <wiencek@anl.gov>]

I have always identified Alpine heads by the casting date.  After looking over 
the ones I have, I noticed that all the 1600 heads were casting # 1980813 and 
that the one 1725 head I had was casting #1980987.   Can other people on the 
list check their heads and see if all 1725's are casting #1980987?  Thank you.
Tom