Peak HP from LA block w/ no problems

The cooling system is only as good as it is. If you have a 3 core 22" radiator, and no air moves thru it, it wont do. If you have an engine with 1/2 it's colling jackets still full of casting sand, it wont run cool running 3 of those radiators. Engines are air pumps. Heat is energy that is lost from the power pushing on the piston top. So, technically, the more efficient the parts are at capturing as much of the the energy, you have little left for the cooling system to absorb, transport, and then dissipate thru the radiator. Think of the radiator in say a 454 CHevy truck, vs a new Vortec V8 in a new truck. The old one is larger. Sometimes twice the cooling fin area. The new engine retains much more of it's heat from combustion, plus sheds more thru the oil system by design. Now, a stroker has all the same surface ares on both the pick up and the drop off parts. So by itself, the cubic inches do nothing to raise the amount of heat it generates. A 500hp 340, anda 500hp 416, will generate the same heat. It's up to the parts selection and setup as to whther it puts more into the coolant, or the piston top.