Is there a way to tell when a head was manufactured?
For instance, the '55 engine I have in my P15 has the following numbers & notations on the head: 12.10.54; 1616823-4; and a 'D' & 'N', with an arrow below it pointing to the 'D'. I assume the first is the date code, which would make sense for a '55 engine. This head also has the smaller hole for the temp gauge, because the '55 models had an electric sender unit.
I have another head which I believe to be out of my 49 1st series (P15). It has the following notations on it. 12-1; and 1120803-8.
The reason for asking is because my brother has an engine from a '51, which also used the capillary style temp sending unit. We had some things stolen from our cars in our parent's back yard, and we're trying to establish if the head I have is from the 49, or the 51. The one I have I had moved into the shop before already, possibly years ago, but I don't remember when. (My extra bell housing has also disappeared. - I assume stolen when the other stuff went missing.) Both of these engines were torn down back in the early '80's.
Thanks.