Definately do the retainers.
You can save the engine if the oil pump nut falls off by shutting the car off right away (happened to me:???:), but when a valve drops into the combustion chamber all you can do is
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You can save the engine if the oil pump nut falls off by shutting the car off right away (happened to me:???:), but when a valve drops into the combustion chamber all you can do is

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