I have read the sticky, just making sure of details.- I have PAC 1218s & nsa rrs, with a 218/230 .535/.569 110 cam on stock 97 LT1. Do I need to purchase shims, +0.050 locks, retainers, etc to achieve the desired 1.8 height? Thanks oke:
Spring height for LT1 is usually 1.75-1.78" measure with a valvespring micrometer or dial vernier caliper between the retainer and spring cup. Purchase the recommended retainers and spring cups. Shimming reduces installed height and increases seat and open pressure. Also reduces the amount of valve lift before coil bind (turns of coils contact each other) reducing the maximum cam lift allowable. Run them at the manufacturers reecommended height or the LT1 height.
These cost less than micrometers and work well in many measurement applications.
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