Well, you asked! My 2 cents:

Backgroud: I've been flying for 21 years and I've been an owner for
most of those. My Super III is plane #5.

For really major upgrades like you are talking about, you are always
better off selling your plane and buying the one you want to replace
it. Things like this always take longer and cost more than you thing.

We're only talkling about 20 hp here, but it's going to cost you many
thousands of dollars to do so. Probably tens of thousands. Someboy on
Musketeermail upgraded (from a Sport, I think) to the IO-360. I was
peripherally involved because I tooks some photos of my prop/cowl to
assist him. It eventually got approved, but it took a looooonnng time.

Probably the easiest/cheapest way to do something like this is to find
a junk Super and take everything firewall forward. Good luck finding
one in a salvage yard that doesn't have a bent prop and engine mount.

I really like the Super and it certainly climbs better than a
Sundowner. But it's only about 15 knots faster. I think your money
would be better spent on avgas. And on most trips, the time difference
is only going to be a very few minutes.

If you still want a Super, why don't you just go buy one? They show up
fairly often. Sell your Sundowner. Since the oldest Sundowner is newer
than the newest Super, the dollar difference might end up being zero.

Best regards,

Steve Robertson
N4732J 1967 Super III


--- In musketeermail@yahoogroups.com, "jboyd1060" <merlou@c...> wrote:
> Still relatively new to the group but curious about the Super III vs.
> the Sundowner. It looks like the III has an IO-360 200hp engine while
> the Sundowner retained the O-360 180hp. Haven't found an engine STC
> for the Sundowner but curious if anyone has done an upgrade to the
> IO-360 (maybe through a 337?).
>
> Jim




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