going lower on the pressure should help out by takin some stress off your patch sometimes these ole radiators after so many years aren't ment to handle the high pressure like mondern cars have, i pulled a radiator out of a 65 2 ton chevy and when i pulled it there must have been bout half way full of brown coolant, someone took the top hose off and a mouse made his home in the radiator so i had to take it someplace and have it clean, and they said that they'd clean it and pressure test it... well it failled the pressure test with bright flying colors, the guy said that there were holes absoulutly everywhere,
a good friend of mine back when he was a mechanic pulled a radiator out of a 50's something chevy radiator was prefectly fine no leaks, he pulled it out of a running truck that was driven, he pulled radiator out, put it in the water tank and pressure tested it... ran er up to 16 lbs and holes everywhere....
maybe your rad. its good enough to handle the pressure (besides the leak) but just a little more food for thought
Nate
