Originally posted by Christ
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I wouldn't. I'd hose the head to return to the pump, skipping the intake. You block the head, the cylinder jackets and head will be stale water (I've heard this situation with hydronic called ghosting? ) and you'll get hot spots until tstat opens.
Pump pushes water into front of block, around bore, up into head, intake, then to core, back to pump housing .
In a normal system the block, head and core circulate within itself. If that doesn't keep the tstat happy, it'll open for exchange. If radiator assistance isn't enough, then fan is called.
I'd gamble a brazed leak before trying to pit water jacket bore....
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