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with the engine on #1tdc,tighten rockerarm until no free play in push rod the tighten 360 deg. adjustexh.1 and 3 intake 1,2,and4 then rotate engine crank shaft 1 turn and adjust exh 2 and 4 and intake 3 in same manor
according to the manual specs on the GM 3.0 engine in your serial number designation D187 the valves are non adjustable.
Could you tell me the gap setting for the valves. Thanks.
circular pattern starting in the middle working your way out
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