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questions about changing pistons

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Old May 25, 2019 | 11:07 PM
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Default questions about changing pistons

Does a re-balancing need to be done if going to lighter pistons? It would be approx 435g (stock cast LS1) going to 399g (Mahle Powerpak). I don't know the pin weights, I'm guessing about the same (these are all stock pin diameter). Related question: 4 of the rods are being honed for out-of-round, with .002 oversize bearings I believe. Will that affect the weight and balance also?

Also, anyone know about the rings that come with the Powerpak pistons - is the oil control ring the lighter type that lets more oil through? Don't want even more oil through the pcv.
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Old May 26, 2019 | 10:54 AM
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Absolutely a re-balance will need to be done. Anytime you start changing things on the bottom end, it's always safe to have it done, especially considering how cheap it is.
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