I've seen them clogged often in engines that only did around town driving, and didn't get their oil changed regularly. Something you can do, that will help the other push rods, is to add a quart of Slick 50 the next time you change the oil. Now, I know how everyone feels about Slick 50, and I've seen the stories, but I'm telling you from first hand experience, it works, and it won't damage your engine. It's the only additive I believe in, but I believe in it whole-heartedly, no matter what everyone else says.
Take care,
~Chris
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