My question is about the main bearing "girdle" on a D16A6 motor.
I have a few of these around and was just looking one over today and this one has a 1 piece casting that covers all of the main bearings. Another one I've had apart has separate main bearing "caps" and a bridge/girdle that goes over the top of all of them. I don't know the history or vintage of either of them, but the blocks both read D16A6. In my '88 OEM manual it looks like the 1 piece bearing cap is an HF part, but the HF motor isn't a D16A6 is it? Were the bearing caps different over the years?
Any help info/clarification would be appriciated.