Ponycarsmike,
After I removed the radiator. I took out the thermostat and put back the thermostat housing and bypass hose with the old gasket still on (new housing gasket after rust treatment). Next I took off the bottom hose and put a condom on the cast-iron intake tube just under the water pump. Then I put a baggie over the condom with a rubber band to hold back the bulge that would be there without support. When I poured the Evapo-rust into the thermostat housing via a funnel it took the whole gallon but the gallon did fill it up to the top of the filler neck (it's a 289). I must say the stuff works great but it's pricey -- at Harbor Freight its $18.00 a gallon but you can use the stuff over and over again like carburetor cleaner. Their claims about the stuff not impacting paint, plastic, copper, brass, aluminum etc. are all true. Naturally I can't see inside the heads but I can see a few inches down the intake manifold and it's clean and "nickle colored" inside now. The radiator came out nice too. If I were to do it again I would leave the radiator in the car and pull both hoses and put condoms on both radiator necks and fill the radiator right on the car. No need to "rod out" a radiator anymore this stuff gets all the rust and turns it into a liquid. Before I started this project I dropped three very rusty 3 and 4 inch long bolts into the solution and within 30 minutes they were clean and "nickle color". The metal has to be immersed in the chemical you can't just paint it on -- I think it must have something to do with lack of oxygen or something. Thank you for your interest and I think we'll hear more about this stuff in the future. | 
