Bore spacing:
53-58 Dodge hemi/poly: 4.1875
52-57 DeSoto hemi: 4.3125
51-58 Chrysler hemi/poly: 4.5625
57-up Plymouth/corporate poly/wedge: 4.46
58-78 big block: 4.80
Note: Victory Library has a list of common bore spacings, but mistakenly lists the gen III hemi as 4.09, which is the actual bore of the 6.4 liter hemi, not the bore spacing. Bore spacing of the Gen III is the same 4.46 as the poly/wedge 318 etc. (277, 301, 303, 313, 318, 326, 340, 360).
