best to fix head. even block off will not get tight enough to stop leaking. not easy to do for non equipped mechanic. there are two ways to do this that I have done. you can heli coil head or you can tap head deeper and make custom longer feed bolt.
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want a piece of the yellow car? (buy it)
you have to beat the blue car first
and then you have to take on the IV
my favorite quote
"if the solution is simple, God is answering"