450 degrees running,,, 500 degrees for short stints
safest maximum cylinder head temperature
Yes going to get a head soon as I can. Was thinking maybe Fred will be selling them again.With a stock head on a hot summer day 385°f is acceptable. Cooler is better. Performance goes down as temperatures go up. With a big aluminium after market head you'll run a lot cooler and have better performance.
Think I'll invent a small electric M/B fan that comes on at IdleDarn wrench I’ve knew they were air cooled engine but I was not thinking about over heating while idle. I had a darn senior moment and only 47 yrs old.lol