Mine is attached using star washers and plain nuts. Superior IO-360 engine, but shouldn't be much different than the 320. I suppose one could drill the studs and use castle nuts, or maybe metal locking nuts. I'm not an A&P so maybe someone else with more experience will add better information.
greg
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Greg Arehart
RV-9B (Big tires) Tipup @AJZ or CYSQ
N 7965A
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