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Yes you can change out one lifter , you have to do the normal break in procedure .



Man...really? I gotta run it for 20 minutes above 2500rpm...?

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There's a reason for the lifter not working properly, take it all the way apart including the little poppit valve and spring on the bottom of the lifter cup, it is a one way valve that may have a tiny of trash or debris in it



I have taken it apart already, thats the weird part...popped the retainer out, pulled the valve with spring, cleaned it out with PJ-1 aerosol, ran the compressed air through it, took out the little recessed tip, cleaned that out and filled with it a little bit of oil. Put it all back together and bench bled it on the drill press.

Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s