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i would do what barry r said and set them on the tight side at least initially. too loose and they hit the sides of the lobe and miss the takeup ramp for lack of better terms.
my 351 block ex opened up about 8-9 thou on avg., int about a thou less.
idle in the 1000-1200 range will help the lifters live longer lives i've read. mine idles at 1200.
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