You'd need to see how deep the thread goes. Also it maybe be possible to go deeper after helicoiling them. The beauty will helicoiling is that its a stronger thread. The issue with the larger holes being drilled is that they get awfully close to the cam bearings.
The issue isn't how deep the thread go to be honest. The issue is that the aluminium weakens (becomes brittle effectively) and allows the threads to be broken away. Similar to the exhaust studs as well which are known for falling out.
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