[tekuhn]

@Rocky, I don't mind sharing the details on the SR block that I own. It is an NOS #9799915A which is the 1970 Ram Air IV part number. It was cast on January 6, 1973. It was fitted with cam bearings, cam retainer, galley plugs, freeze plugs, head dowels, timing cover dowels, 4-bolt main caps, and pistons with pins and rings. There are all 5 mouting pads machined, drilled, and tapped. There is no large year cast near the distributor hole. The factory wire-tag with matching SR number was still attached, and the whole assembly had been dipped in Cosmoline to preserve it. The entire part number was wiped or ground off and then restamped since the '73 part number would have been completely different.

Interestingly, the pistons appear to me to be cast. I assume perhaps they used these for replacement of both RA-III and RA-IV engines and equipped them with either cast or forged pistons accordingly. That would make sense since most if not all '70 RA-III engines had 4-bolt main caps (unlike '69).

The block is still un-used, so please let me know if you need any more pictures or information.