Head gasket sealer 2yr/10k mile test, with disassembly.

Nothing but a .........

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It all depends on exactly how and where the head gasket is leaking. If it's a leak from the combustion chamber to the water jacket, none of these will work. If it's a leak from the water jacket to the ambient pressure (outside) any of them have a chance. Block porosity and things like that are possible to fix with this stuff, as are radiator leaks.
And no, I didn't watch the video.
 
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