I bought a set of Johnson #2112OPR lifters from Butler. Standard travel. I didn't quite understand the preload instructions on Butler' webste : Preload= .035" +/-.010 + 1/8-3/8 Turn**. I emailed Johnson. The response was .035 +/- .005. On a 20 tpi stud that .030to .040 variance equates to .6 to .8 of a turn. So roughly 3/4 of a turn should do. Since the pushrod cup is a short length away from the stud, one turn at .050 on the stud will not equal .050 because of rocker arm ratio. However I believe the minuscule difference will not matter. Perhaps I am being anal, but just for s***s & giggles I plan on doing a measurement eventually.
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Frank M.
75 Firebird
68 Firebird 400 RAIII
66 Chevy II 461 Pontiac in AZ
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