Fatigue and fracture cause crack in metal bridge and even aviation aluminum structure, engineers come with this simple crack-stop holes solution but the hole size must be carefully chosen.
An air cooled engine is expose to greater temp variation so I'm a bit skeptical this solution work at long terms but it's your call and I wish you good luck with it.
As far the OP is concern his engine core is already good for the trash so no hole or even "magic" welding can save it from his grave, R.I.P
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Gilles.
1988 2072 401 54" hyd angled blade
1988 1872 364 snowblower/C50 deck
1976 1650/QA42A blower/44A deck/standby
1976 1450TS/Sleeve hitch/44A deck/in storage
1963 100 (red)/in storage
2010 Kubota 2380-2/42" infinity deck (engine swap)
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