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4 Tec piston stock size?

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vpinzon

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Rebuilding this 2010 RXT 215 and it looks like it has an SBT engine in it. Engine blew and took out the crank case. Ive purchased a doner crankcase but im trying to figure out if the 2 good pistons can still be used. They look in good shape and looks like this engine was pretty new when it died.

My issue is the pistons are SBT pistons and have the marking 0.50 on them. Is this .50 over and not stock size? Or are these the same as stock?
 
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