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If you remove the head then of course you replace the head gasket.

Where can you get sodium silicate to fix a blown head gasket?

Know that adding sodium silicate to an engine is only a temporary fix for a blown head gasket and will not permantly fix the problem. The only permanent fix is to replace the head gasket. I would never add any head gasket fix material to any engine.

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Q: When replacing valves do you need to replace head gasket?
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