Reply To: 1957 Evinrude 7.5 head bolts

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October 29, 2022 at 4:35 pm #268408
Marion Hansen
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    A wild guess on my part is that the threads are national coarse 1/4-20.
    I might suggest that you run a thread tap in these threaded holes before installing new head bolts. Many times these head bolts are hard to remove. The sealant used at the initial assembly left a gluey residue in the threads.