First Start - C59A

[Brian]

I think the reason you saw hi coolant temps is because of the way you have configured your top hose[s]. I've always understood that the cooling principle with these engines is thermo-syphon with water pump assistance. The top radiator inlets are higher than the outlets in the heads, on account that heat rises. But you have got the highest portion then dipping quite considerably downwards, the hot coolant's natural tendency will not be to follow that route. I see you've got little bleeders so you can purge air out of those top pipes, so doubt your high temps are on account of an air pocket. I could be totally wrong, you've obviously put a lot of thought and work into this....good luck! It's always real satisfying to hear the engine 'speak' for that first time.