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We lubed our Comp Cams retro-fit hydraulic roller lifters with our Royal Purple assembly lube before installing them into the lifter bores. We didn't soak the lifters before installing them per Comp Cams recommendations. In the old days, you had to soak the lifters in oil overnight to let them fill up but no more. We plan on priming the oil system before installing the distributor to ensure complete system oiling before start-up.