So now we're back to the original question, are aftermarket caps worth the money and effort? Will it buy me more time, help some, or other wise am I better off just leaving it and crossing my fingers until I can get a better block?

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Why put the money and effort if your going an R3?
Run it stock and hope for the best. It would be a shame to put caps on along with the machining expense if something were to go boom.