I'd say it should be able to handle 200 +/-, "normal" might be about 190/195, but the fact it overheats [not badly] on a long run would make me suspect the elec fan is inadequate - might also have to do with a lower pressure cap on the old rad than the 350 likes .... at least it should be lower pressure for a rad that was designed for no pressure grin

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics