I have a 1980 F250 with a 351 engine. I do not know how to tell if it is the 351 M or Windsor. I do know it is supposed to be in the VIN but can not find out for sure how to read it since all the resources I find online require a 17 digit VIN and mine is only 11. My VIN is X25GKHD3704 Any help would be appreciated.
Thanks