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Unlike many other brands, the 350 Chevy has independently adjustable rockers. From the #1 TDC position, you can adjust 1,2,5&7 intakes, and 1,3,4&8 exhausts. Rotate the engine one revolution for #6 TDC, and do the rest.
When adjusting the rockers, tighten the nut until all backlash is removed. Then tighten an additional 1/4-1/2 turn. This is for hydraulic lifters. For solid lifters, refer to the cam card for the backlash setting cold, and use a feeler gage between the rocker and valve stem to tighten the nut until the feeler gage just slides through.
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