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looks like it's drilled for both the real 11 and the 10 1/2/- 11
I'll guess hemi they used several different flywheels and bellhousings over the years- and starters
6 pack would have a weight - right
Maybe check the ring gear for a number.
FWIW from an Ebay ad.........
NOS Mopar # 1673-646 172 tooth flywheel ring gear. Fits 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 various Plymouth, Dodge, Dodge Truck, Chrysler vehicles with 6 cylinder 170, 225, 251 engine, 8 cylinder 273, 318, 325, 350, 354, 361, 383, 392, 413 426 engine all with 172 tooth gear. Double check your parts book for exact application before purchasing. Item has 172 teeth, has number 1673646 stamped into it and measures 13 1/2 inches inside diameter, 14 1/2 outside diameter end of tooth to end of tooth. Also fits some marine and industrial applications; boats, air plane tugs, fork lifts, cranes, irrigation pumps etc. Please check out our other auctions.
i would say indust engine might have needed the size of it for rotating weight . indust motors ran low rpms . the ind 413 was 8 bolt for stick trannys but 6 bolt for autos . all early hemi stuff was 8 bolt cranks , all 426 hemis had 8 bolt cranks .