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People like to use those valve covers because the breather hole is on the side, out of the way. So it makes for a cleaner looking engine. And if you plan to convert your LT1 to the LS1 style mutiple coil setup you need valve covers like this if you want to mount your coils on top.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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