This has been done before. I've tried it myself by adding a plexiglass top to a set of covers that had the tops removed. it was alot of work, and a waste of time. The problem is that plexiglass becomes permenantly "fogged" due to the heat. Before long, they look just plain ugly, and you can't see anything anyway. I met a guy who tried something similar using pyrex glass instead of plexiglass, and he said they were a waste of time as well. Right after start-up, condensation forms in the valve covers, and fogs the glass. Between that and the oil, he said you couldn't see enough to justify doing it. That and the fact that it really sucked when he dropped his torque wrench on one and cracked the glass.
Take care,
-Chris
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