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I need to know if there are any differences in the blocks, my block needs re sleeved and I have found a 6 block for cheap so will it work?
 

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yes the blocks are the same the heads change though with years and with emissions if you have a cali emissions head or a can/fed emissions.
 

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The mazda6 block lacks a upper left boss near the water pump for the the alternator.

Meaning when you use a "6" block you only have three bolts to hold on the "3" alternator.
 

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you could use a fusion alternater, they use 3 bolts
 
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