While I have my motor off I am thinking it’s a good time to replace the original aluminum heater valves with Stainless.
Spruce lists them for $235, anyone have a better source?
Does Aircraft Innovations sell them directly?
I've got one on the shelf I'm not going to use. I'll take $125 for it and include snail mail shipping conus if you want it.
Full disclosure, The reason I'm not using it is that I didn't like the way you had to control it with a cable on the firewall side. I went with the triangle shaped one that you can control from the cold side.
SNIP>>>
You can't really direct the waste air where you want it when it's closed, it just pukes air out opposite where it goes in with no flange to connect a scat tube or anything else to deflect it. SNIP
What I did with the triangle type valves. I used a piece of Kool Mat between the valves and the firewall, holes cut out to match the valve outlet. I left the mat long with the excess going vertical above the valves. This excess then laps over the front of the valves, directing the hot air (valves closed to the cabin) down to the bottom of the cowl. This solved the problem of summer time dumping heat muff air directly at the engine - and engine driven fuel pump. It also reduces tunnel heat in the summer as it provides insulation between the hot valves and the firewall.
https://www.aircraftspruce.com/catalog/appages/koolmat.php
Carl