the hole has to exist in all hydraulic lifters...flat(incl solid) or roller...it's how the oil gets pumped up thru the P/R(which is why all P/R's are hollow) to each rocker/spring for lube but more importantly...heat removal...them springs gets mighty warm...
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2010 SS 2SS M6 - Tune by RDP dynoSteve!(Woot) - Daily Driver - 150K! - All work by me...
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