I keep hearing people talk about the Mercury Mark 58s all over the place over the years and even have a complete hardly worn standard bore long block myself that was electric start but what is really the attraction from a technical standpoint??? The basic message that they make a good basis D-Mod or E-Mod motor depending whose sanctioning body isn't much of an answer. Seems everyone knows they are 44 inch and they had KA carbs and a different piston casting from the underside that the lastest model small wrist pin versions pistons hung on Merc's 600-4 connecting rods and large brass/bronze reed blocks and that they go like mad too but why the desirability the way people speak of them they are legendary for some reasons??? Why? I haven't heard a technical explanation yet in all these years! I just talked a person into buying one because it was in excellent shape and could still run good even though it was still factory sealed.
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