Does anyone know if the 3.9 block is the same as the 4.0, can it be bored to same as the 4.0 , the crank and rods are the same but i need to know how far you can safely bore them ,thanks
No they are not the same - Yes you can bore a 3.9 to 4.0
You probably wouldn't bother though unless the block was excessively damaged and needed to be bored that far...
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