i have a 360 .030 over rv cam, stock heads, exhaust, ect. this engine has always had overheating issues even with alum radiator.

initial tuning was 10deg timing 15in vac at idle.
ran hot 200-220.

after reading a post here about tuning with a vac gauge i went back and retuned it. i ended up with 20in vac and tuned mixture and idle.
now it runs 170-180.

before it would run over 200 with oat of 30
todays current oat is 60 and it was running 180

can someone explain why this would make it run cooler, i thought basically temp went up with timing (sort of).

thanks shane