Head stud warning
Head stud warning
Just a friendly warning about the use of head studs instead of bolts on the Mercury race engines.
I have a Drag motor that arrived for me to build going on an F1 boat in Australia, after inspecting this block I found a hole in the exhaust port behind a head bolt boss which indicated that head studs were used. My guess that the studs were ran up with an impact or no consideration was taken for the lack of thickness behind this boss being so close to the large exhaust port.
I have a highly ported steel sleeved motor at my shop with all six exhaust ports in alignment with these bosses have holes punched through because of a careless instillation of studs...
Good luck,
Jay
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