I did talk to them and determined that my engine uses the 436ZA. contact with used listings showing either number can't seem to tell me how they decided what number theirs is.
Around 2007 the BF225A blocks went from part#12000-ZY3-416ZA to 12000-ZY3-436ZA. Can anyone tell me how to identify the differences in these two blocks? I need a new/used one for mine and not sure what I have or how to be sure I get the right one. And what is physically different?