I'm trying to figure out what brand planes/tabs I have on my Magnum 27 Sport. They may be original from 1974. They look a lot like Kiekhaefer K-planes but there are no marks on them except a small "almag" cast into the top.

Any ideas?

Thanks...

That's probably what they are, but how 'bout some pics?
This way we can identify them.

Here are some pics.

Are they early 70s K-planes?

They look like old style K-Planes.
The transom mounting plate looks like a Merc style.

Maybe someone else has a better idea.

I should know this, but I can't seem to retrieve from long term memory. I kind of remember Mel Riggs in WI making something like that. I do know that those are Mercury outboard cylinders.

So are they what Magnum would have used in 1974?

Most likley, I had a 1972 27 Sport back then, but it did not have tabs when I bought it in 75. There was a guy racing Magnums back them that had a foundry, he was making some stuff too. I remember getting bronze gimbal rings for the Volvo's the boat came with.

Any pics of your Sport?

Mercury Marine(not Kiekhaefer AeroMarine) sold cast aluminum tabs like those before Kiekhaefer came out with K-Planes in those years & for many, many years after. Although the popularity of the K-Planes took over & fewer & fewer of the Mercurys were installed at the O.E.M. level. They were called "Mercury Heavy Duty's" & did use the power-trim cylinder from their current in-line six & in-line four cylinder outboards trim system. The cylinders were very capable & easily rebuilt. Another cast trim tab that was simular in those days was offered, mostly to racers, by a company called Wolverine Trim Tabs & were available in two different lengths. They also used the Mercury outboard trim cylinder. Ed

Good info.....thanks Ed.....