150hp STC for PA-12 or -18

StuBob said:

I'm back to idly shopping, noticing very low prices on PA-12s with run-out O-290s. In the same way, PA-18s with less than 150hp have significantly lower prices on them.

What would be the likely cost of upgrading from an O-290 to an O-320, and who holds the STCs?

Thanks. I'm sure this comes up often, but I couldn't get any search terms to return useful results.

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pa12drvr said:

Very much FWIW based on fading memory for a -320 install on a -12.

- Circa 2007 era: cost of reman'd narrow-deck 160hp 320 $13,XXX
- STC (more below): $320 (cute)
- Labor, -18 tailfeathers with covering, and a few misc parts: $4000
- for the -290 to -320 switch, likely a different prop will be required...I had that already.

In addition to the STC holders listed by others (Univair, Kenmore, Charley Center / Crosswinds), there was an STC holder for "...any 0-320" that I used. No access to my logs right now, but I'll see what I can find in about a week when I've got access. Need to carefully look at the various STC's for a 320 switch on a -12 to see what else is required (may require specific mounts and using PA-18 tailfeathers is a pretty common requirement). Also FWIW, in my case, I was able to sell the 0-290 (and my old prop) to a guy building an airboat for about $3000.

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