Sorry, maybe I worded it badly. I know the definition of "bored spacing."The distance between the centerlines of each cylinder bore. If it wasnt stock, you would also have to manufacture your own crankshaft, heads and rocker shafts etc for it to work. Stock bore spacing is required in all pulling classes.
If you look at big, big cubic inch gasoline stuff, like Sonny's, they change the bore spacing so the bore size can be humungous and still have material between the cylinders.
I am asking what the spec is for the bore spacing on the block in the OP.
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