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This method works for hydraulic cams in small or big block Chevies with adjustable valvetrain.
With the engine at #1 TDC you can adjust 1, 2, 5, & 7 intakes, 1, 3, 4, & 8 exhausts. Rotate the engine one revolution for #6 TDC and do the rest.
To adjust: Start with the rocker nut loose enough to feel up and down movement in the pushrod with your fingers. Tighten the nut until there is no more up and down movement of the pushrod, plus an additional 1/4-1/2 turn for lifter preload.
For solid lifter cams: Place a feeler gage between the rocker and the valve stem and tighten the nut until a .001" bigger feeler gage won't fit. The manufacturer's cam card has the backlash figure that would be used for the first feeler gage. There is lots of fine tuning that can be done by changing the backlash to a slightly higher or lower number to move the torque curve a little.
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