½” Head bolt capability
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Posted Friday, January 04, 2008 7:35 AM
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Heads need to be able to use ½” head bolts.  Stock factory heads can be drilled without hitting water so that ½” head bolts can be used.  Likewise should be the same with any aftermarket replacement heads.  One idea is for the head bolt holes to be ½” except for a shoulder at the top to accommodate a 7/16” head bolt.  If using a ½” head bolt, then the shoulder is simply drilled out.  This feature is already on a variety of the SBF aftermarket heads so the heads can be used on either 302’s or 351W’s.

Lorena, Texas  (South of Waco)
Post #9143
Posted Monday, March 03, 2008 2:12 PM
Supreme Being

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If you drill out a threaded 7/16 hole in the block to the recommended bit size for a 1/2" tap, will the bit remove all of the 7/16 threads to leave a clean hole to tap to 1/2"?
Post #10572
Posted Monday, March 03, 2008 4:26 PM
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The recommended way is to just run the 1/2" tap into the 7/16" threaded hole. John has used this method and states that it worked fine.

Glen Henderson

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Letohatchee, AL
Post #10575
Posted Monday, March 03, 2008 5:26 PM
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Thank you for that info, Glen.
Post #10577
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