The terms ‘D’ block and ‘square’ block apply to differences in the casting of the engine block. The ‘D’ block is the earlier casting, in fact the initial casting of the 351C block and the ‘square’ block is the later one. How much later is open to conjecture. ‘Square’ blocks would appear to have been available in the U.S. in 1971, and there is some evidence to show that the ‘square’ block appeared in automatic XY 351C 2V’s as early as May, 1971, and in manual XY 351C 2V’s in December, 1971. It does appear that XY 351C 4V engines continued with ‘D’ blocks. What can be said though is that no XW or XY GT came with a square block, and that all Australian built engines are patterned after the ‘square’ blocks.
The ‘D’
The ‘D’ can be seen on the cast extension on the front of the block, adjacent to the petrol pipe.
Compare with the later square block.
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