Also had an acquaintance in the Arctic (where Nat gas was available) who ran 4cyl ford gensets to power his house and ran the rad air under the house to supplement heat. He saved 1/2 - 2/3 on heating costs and his electricity cost was around 30 cents/kWh where the utility charges 59.5 /kwh so it was a huge saving for him. He ran them 2 years, replaced the head, ran another 2 years then replaced the entire unit and did this for many years that I knew him.
CM - were those heads spec'd for Natgas ?
I know that on SuperDuty gas engines, Ford has a head option for Natgas/Propane Prep.
I'm curious in general, but that post about Hutch Mtn had me looking at propane conversion kits, and also the snorkels from these guys
MOTOR SNORKEL TRI-FUEL (Natural Gas, Propane, and Gasoline) Conversion Kit
Who ^ also listed a remote start solenoid kit for propane.....
Asking, because I don't know anyone who has put high hours on a converted-to-propane generator.....
Rgds, D.