Mark 75H Question

[BJuby]

I've searched a bit for information regarding what was "special" if anything about a Mark 75H powerhead. Were they padded, did they have special porting like the 55H's had over the fishing Mark 55. I've found info about the history if the engine. I also know that they had KA-6A carbs. Curious to see if anyone knows about the powerhead.

Thanks

[Mark75H]

The powerhead Entrop set the record with was padded, but there isn't much to suggest the production motors were. 55H porting, 55H type flywheel, KA carbs (6's or 3's) and high volume fuel pump & line arrangement.

Other than those few things, the parts lists and spec sheets show all the same parts

[Aeroliner]

Hi Sam,
The Merc spec sheet shows both KA-3A and KA-6A carbs but I have looked for years trying to find a KA-3A. Have you ever seen one or a set on a 75-H.

Alan

[Mark75H]

Never seen a 3 or a 1