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Are you using the stock oil pump? Ive heard restrictors are only needed when using an after market high flow oil pump on the s1/s2 rb's and rb's with solid lifter heads. I've been reving mine to 8k for almost a year on a new stock oil pump and stock head with no restrictors fine. Only had a hydro lifter bleed off 1 time after 3 back to back runs but went away after idling for a little bit.
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