Not for the RA III engines. Why they used the 979991'5' block for some RA III is unknown as far as I know.
They also seemed to be from Hxx9 to Jxx9 cast blcoks. Possibly they had an excess of 915 blacks and used them for the WS/YZ engines. I have one of those blocks that came out of my 70 Judge. It had all the parts of a normal WS engine, cast pistons and 068 cam.
I would say the 'recipe' for the engine makeup is based on the WS/YZ codes and not on the 9799914/15 block.
BTW, if bought over the counter, the RA III would still have the cast pistons.
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John Wallace - johnta1
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