SBC? For the "Acronym" page. We had a mechanic at work that was always doing some preventative maintenance to his old truck. Changing belts, changing hoses, flush the cooling system, adding this and that to oil or gas or whatever. He had more issues and leaks than anyone else with his vehicles. Some radiator flush is acidic and can cause leaks in old radiators and attack hoses. It can also stop up small passages in the radiator from stuff flushed out of the engine. Do you ever get all the flush out? My old F150 has never been flushed, still has the original hoses, use a 50/50 (rust inhibitor & water pump lubricant) and anti-freeze, if I need to add fluid. Transmission fluid was finally changed when the extra cooler was added six months ago. Both shop guys, maintenance and transmission, said they would drive the truck anywhere. Headed to Florida in April.