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Sounds like the crank isn't straight to me. Remove all the caps and all the mainbearing shells from the block except for the first and last. Check runout on unsaddled main journals.
 

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Discussion Starter · #122 ·
Sounds like the crank isn't straight to me. Remove all the caps and all the mainbearing shells from the block except for the first and last. Check runout on unsaddled main journals.
Wouldn't a bent crank get tight at 2 spots 180* apart?
 

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I guess it would depend on how perfect the main bearing bore is.
 
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