abody340,1976-77 225 engines are PN 4041314 forged crank and PN 4071072 cast crank. Based on those numbers, I would guess you are probably looking at something in the range of 1981 +. If you can find the head casting number, this might help, if it is all the original engine. '79-80 head casting # is 4104362. Head casting # for '81-83 is 4095778. Hope this helps. Thanx, Glenn.
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