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The Comp Cams hydraulic lifters (PN 850-16) were primed by soaking them in motor oil for a few days. Leaving the lifters to soak in oil ensures that they will be full of oil when you get ready to adjust the rockers and prime the oiling system. If they are “dry” it could lead to lifter and cam damage. I also used a Comp Cams spider tray (PN 08-1000) that included the lifter holders and cam thrust button.