Here is what I did to remove the counterweights on a 22nd Series 356 engine using a splined screw extractor. Drilled the bolts to the size specified for the extractor and drove the extractor in with a hammer. Used a beam type torque wrench to gradually apply forceuntil the bolt broke loose then turned it out. The hex on the extractor was only 5/16" so had to use an impact socket after breaking a standard one.
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