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What year did ford change the external balance on the small block? I'm looking at buying a 1983 van 302 to put in my brothers cougar and I'm not sure which flexplate I need. The engine is connected to an AOD which makes me that it is the later balance, but it uses V-belts which i thought was used only by the early engines. Thanks for your help!!!
 

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Ford smallblocks 289,302,351W & 351C have always been external balance.

The standard imbalance for all is 28oz, EXCEPT for the 81-up 302 (5.0L), which is 50oz.
 
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