Re: Oil grooves
While oil does remove heat, it also has to have a pathway to get an even film of oil to all of the bearing surfaces otherwise it will take the path of least resistance and likely neglect a portion of the surfaces causing uneven wear.
The basic model A engine predated designs that started to use engine oil to actually help cool the engine with oil around the exhaust valves and other parts of the top end. The engines that superseded the model A finally started using oil pressure in places that needed it more rather than just gravity flow from the valve chamber.
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