Still, some radiators just have to be removed and rodded out or re-cored if they're too bad. The Prestone stuff is non-acidic and I've seen it totally irradicate the "cauliflower" that has grown on the ends of the radiator tubes. I'm a little squeemish about pouring acid such as vinegar in. Some guys just put vinegar in the radiator and drive it a while to eat away the calcium and swear by it. And the "potion" you put in and then drive the engine for 3-6 hours before back flushing is the Prestone Super Radiator Cleaner here: Oldad, the backflush you're talking about is what the Prestone Flush N Fill kit does. Then drain, flush and refill with distilled water and anti-freeze. Some years ago there were several companies that sold a can of radiator flush where you would drain the radiator, refill with water and a can of radiator flush, run the car several times at operating temperatures. If there is a build up of calcium deposits from using tap water over 60-70 years will flushing clear it? In my experience, the best way to get the crud out of cast iron heads and blocks was a hot tank, but of course this can be done only on a major overhhaul. This message was edited by Old Henry on 9-13-12 2:19 PM Plumb the T into heater hose coming out of the top of the engine. Sending my pumps to Skip.late '36.going to use Sierra antifreeze and demineralized water.best method to flush system? Are there plugs in the rear of the block to remove and backflush? 21 stud 85HP EFV-8 Club Forum - Cooling system flush method
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