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Oil grooves are not reservoirs but act as a channel to feed the wells at the side of the block and cap.Without grooves the wells would soon starve for oil and create the heat you experienced that melted your mains. I don't know who decided they were not needed but they don't need to be allowed to touch a half inch wrench, much less the machines to pour and bore mains in a Model A. I know the builder and this is only the tip of the iceberg when it comes to his work and shortcomings. I don't like to talk down other builders work but this one needs stopped whether by public opinion and reference or by lawsuit. He is a liar if nothing.