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Co-Administrator
Group: Administrators
Last Login: Yesterday @ 5:59 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)
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Supreme Being
Group: Forum Members
Last Login: Tuesday, July 29, 2008 7:16 AM
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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"?
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Supreme Being
Group: Forum Members
Last Login: Today @ 5:25 AM
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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
Freedom is not Free
Letohatchee, AL
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Supreme Being
Group: Forum Members
Last Login: Tuesday, July 29, 2008 7:16 AM
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| Thank you for that info, Glen.
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