Don"t get stuck on that 224 degree boiling point. That why the cooling system is sealed...to build pressure to effectively raise the boiling point of the cooling fluid. I'm sure someone has the actual numbers o this, ie: each pound of pressure raises the boiling point by X degrees. The original "HOT" light on our 'birds did not light up until 246 degrees...
EDIT: I just reviewed your original post. IMO, the 3 core rad ain't gonna do it for your 455...ever.
Last edited by Bronze Bird; 04/13/0911:15 PM.
I'm a hobbyist. Not a professional. Don't be hatin'!