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One thing to remember...JB Weld is a structural EPOXY. No matter how you slice it, epoxy is not welding or silver soldering. I don't care if your Uncle Tony patched a cracked block with it, it's still just a 2 part epoxy and subject to the same failings of other adhesives. I agree with the idea...

I think where the "20" comes in is the readings on a dynamic check should not vary more than 20psi across the board, and on a static (differential) check, you should have less than 25% leakdown. EG...175 on 7 cylinders and 105 on 1 = bad. On a leakdown check, 175 (minus 25%) = 132 (minimum...