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Generally speaking a blown head gasket is an indicator of a greater problem. Head gaskets can blow for a number of reasons:
- Surfaces are not clean. The block and/or head has pitting and needs to be milled.
- Old head bolts or studs were not replaced and are stretching with each torque.
- Over heating of the engine due to poor water flow.
- The head was improperly torqued during restoration.