bearing question

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bballfan1

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got 340 apart to put new bearings. All the old ones have is AT-20 stamped in them. what does this mean? Rod bearings nothing except CL or LC stamped on them.
 
Has the engine been rebuilt previously? Typically, -20 means 0.020 oversized. You need to measure the mains and rod journals to know for sure. 65'
 
Its a factory warranty engine that has been sitting for 47 years. Replacing bearings wondering what that meant
 
Really? What makes you say that? This is how it came from the factory part numbers on pistons are 2899480-1
 
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