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i did the timing chain job myself too. mine's a 92 and it was starting to get noisy so i went in to replace the main chain. i think it did have the hardened b/s sprockets because they were still in pretty good shape.
i've spoken to a couple of mechanics who have had cars come in with the b shafts removed and they say it is noticeably "rougher".
good luck and be careful when pulling that timing cover off...
posted by 66.123....
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