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Old Oct 4, 2004 | 12:02 PM
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I have what I believe is the correct water pump for my 70 LS-5, casting #3940960 dated B11 70. This has the 5/8'" shaft. I have two pullys one two groove (5/8") & one three groove (3/4") neither one are correct. Given the cost of the correct pulley - $102 and water pumps I will probably switch to the later 3/4" shaft water pump.

Does anyone remember when this change was made? I think it was 72 or 73?

Thanks

Jim
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Old Oct 4, 2004 | 12:35 PM
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I believe it was '71, because '71 - '82 are the same...
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Old Oct 4, 2004 | 12:37 PM
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71 SB water pump went to 3/4" shaft so I'm thinking that was the year for BB as well?
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