Re: model number and serial number decode
Hi Jcrain<br />Here is an interesting note for you. My OEM year model guide lists your 457HF as a 1973 model w\alt. and long shaft. The interesting part is they start with ser#4001. There are earlier 457 models going back to 1967, but no "F". As for you, when ordering parts. It is important for you to know the type of ignition system on your motor, the type of charging system, the type of starting system and probably wether it is long or short shaft, if those parts are concerned. There were seven (so called different) models for 1973. Let's say half were made in Canada, denoted by the first "B" in the mod# (i.e.457BF) and half were long shaft (457HF-457BF) (Short 456HF-456BF)you can see this gives Four model#s for the same basic unit depending on shaft length. Now, times that by seven major categories, this will give us at least 28 different model#s for 1973 (give or take) depending on how the unit is equipt.