LS dod delete the right way. Doing this prevents air from getting trapped when the oil fills it up.

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LS have shown delays in pumping up the lifters. When you start the engine with the valve cover off, you will notice it takes some lifters up to 30-60 seconds to fill with oil. I believe this has, in part, something to do with oil having to fill each of these DOD valley holes, which inevitably has air trapped inside and that air has to be compressed. Ultimately this should improve the system oiling pressure and response time getting everything oiled up. Let me know what you think.

alexanderknight