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4.0 Rebuild question

classic96xj

NAXJA Forum User
Location
Harrison, TN
Ok so I bought a 94 4.0 for very cheap to rebuild and replace my worn out 4.0
The thing that has me worried is that when I pulled the head the first thing j noticed was that the pistons have 50 stamped in the top of them
Does this mean the motor has been bored out .50 over or could it possibly be a factory thing?
Any help is much appreciated
Thanks
 
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