valve adj. on engine while on engine stand before. start up

MoparLeo said

Get out or upload the Factory Service Manual and follow the procedure.
Service Manuals – MyMopar

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The FSM doesn't cover hydraulic lifter preload when using solid lifter adjustable rockers. The '70 TA book is as close as you'll get in that regard. Otherwise the FSMs won't mention it since the factory hydraulics were non-adjustable.