Re: noisy lifter
If the additive doesn't break it loose, and you're sure that the cause may be a collapsed lifter, I see no reason why you can't replace just the one. I've done that before...
On the other hand, if your engine is old and your lifters are gummed up, then I agree that you should go with the set. You'll have the intake off anyway. As far as the rods, the only time I replaced them is when one of them was bent. It's really your call...
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