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1/2 Diameter coarse thread set screws will fit these holes too. THEY ARE NOT TAPERED PIPE PLUGS. However the OEM inserts provide for an internal thread designed for the mounting of accessories such as the alternator. Generally there are only 2 inserts required for OEM (front) as the exhaust gases are fed into the holes from the rear of the engine and use a banjo bolt and a fitting at the rear of each head. The passage (if it is an emissions compliant part) runs the length of the head above the exhaust ports and in some applications (aftermarket applications) has to be drilled the last final amount to make it functional. Now go arm wrestle the dealer.
Good luck
Rick
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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