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Rocker shaft shims are for correcting incorrect rocker arm to valve tip geometry not for setting lifter preload.



I understand and agree. But is there any harm in using it for adjusting preload as long as it doesn't adversely effect valve tip geometry?



They will effect geometry even if a small shim is used, watch what your doing. If you use to much you could put extreme side load on the guides and wear them out.

logan426