Take the height from the spring seat to the bottom side of the retainer with a mic, then take the installed height of the spring, subtract and you'll get your shim sizes. Like pizza said, too much shim is VERY HARSH on the valvetrain.
Mine were like 130 at the seat and 343 open at a 1.8 install
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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