Quote:
Originally Posted by Pete
When the screw is broken off below the surface, it really limits your options for getting it out and save the threads. ESPECIALLY WHEN THE SCREW HAS BEEN HARDENED BY LOCAL HEAT.
The safest and QUICKEST method is to pull the engine and have a machine shop machine it out with carbide tooling or EDM.
Heating and quenching is the LAST thing you want to do. That will make the screw and area including the block harder.
If it was flush or higher, the welded washer and nut is the best method.
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Pete's suggestion is the safest way forward. With the engine out the task is just a little easier and facilitates more effective means. Good Luck.