It just occurred to me that the reason for moving the boss for the serial number from the right side of the engine to the area above the water inlet was because that area could be machined at the same time as they were making a flat spot for attaching the water inlet elbow.
Makes sense to me.
I don't know about the Model T but the boss on an A engine was never machined.
Herb, Henry was just getting ready for the fitment of the generator in 1919. Nothing like being prepared. Believe me?
Allan from down under.
I disagree with James on the Model A. The serial number boss was machined that same time as the outlet mounting area--they are both in the same plane. Over time, the appearance of machining has diminished, amazing what a little rust can do--but period photos of stamping blocks shows a nice machined surface
Model A serial number pad was as cast with the exception of some early Canadian Blocks.
This is also documented in the judging standards along with the different font used on some numbers later in production.
Some Model A Ford engine number pads were machined and others were not.
The very early Model A engine number pads were just above the water inlet as was the case with the late Model T's. For these Model A blocks the pads and the water inlet boss was machined at the same time.
Not long after production began the engine number pads on the Model A were moved from immediately above the water inlet boss to the top of the block. Once the engine number pads were moved they were no longer machined.
I suspect that the location of the engine number pad was moved so as to reduce the amount of machining and wear and tear on the cutter tool....as there was no reason to machine the engine number pad.
It is relatively rare to observe a very early Model A engine with the engine number pad connected to the water inlet pad, and as a result few are familiar with this anomaly.
Well, that's interesting info. All my Judging Standards state is that the pad was painted with the engine, and then the numbers stamped, but that, in the interest of preservation, paint on the numbers is permitted. I didn't realize that the cast finish was considered smooth enough to not require machining for the numbers to be legible.