Casting aluminum cylinder blocks was not well refined in those days. This was the 222nd ZL1 block casting but only #193 to make it to machining. Of the other 29 blocks, some were likely scrapped, others eventually repaired and moved on to machining. By the end of the run, the difference was around -50. I have little data relative to the total number of blocks cast but it is obvious they were not machined or assembled in any sort of order. The next block machined #194, was cast 10 days prior to #193.
Tonawanda records indicate they built 180-190 production ZL1 engines. There were approximately 550 castings; many were sold as bare blocks.
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