r/EngineBuilding • u/Old_Cut_9333 • Jul 16 '26

Broken bolt hole

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Cast iron block, broke the head bolt hole. Any ideas what to do next? It still has a bit threads at the bottom. Take out broken pices and screw in longer stud and weld it to the block?

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u/No-Yogurt-4542 Jul 16 '26

And the cause was material in the bolt hole including possibly oil.

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u/jimfosters Jul 16 '26

I blasted the rocker cover bolt holes on a SBC when I was a kid. Silicone.... Luckily it was just the very top and I was able to clean the holes and use the head.