Heater Box Recommendations

[22LD]

Just wondering if anyone has a particular heater box they would recommend for the BH with an IO-540. Thanks.

[Battson]

For cabin heat I used the one Larry Vetterman offers with his exhausts, I believe it's for an RV? Anyway, it works well. I have one muff, and tested it to just below freezing temp so far (summer here...) and it keeps the cabin hot enough to remain comfortable indefinitely. I couldn't say it supplied "too much" heat when it's that cold out, but it's certainly adequate even if you're wearing a t-shirt and shorts. We have one outlet through the firewall.

Given you have fuel injection and don't require carb heat, you could fit two heat muffs if cabin heat is a big deal for you, either in series for much hotter air, or in parallel for a greater volume of hot air.