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I have never seen a CKO block in a CE application...but then I haven't seen Elvis either.
wilma
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I too, have never seen a CKO motor or any other suffix in a CE application.Having said that I have owned and seen several that had a regular suffix but no serial number.I was told that these were over the counter use.The suffix letting the mechanic know what was in side of the short block without opening it up.Just my $.02