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Hey guys, got a question. I'm rebuilding an lmm and I'm going to replace the Pistons with OEM pistons and have the original connecting rods on. Does the engine have to be balanced. Thanks
 

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2020 2500 CCSB Sierra SLT
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You should mark and weigh each piston as they come out. Then when you get the new pistons, weigh and match them to the respective cylinder. That will give you the best chance of having the same balance as the old ones...
 
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