The 360 build that has more turns than Willow Springs

mopowers said

Is there a meaningful weight difference in the magnum pistons? That may be another consideration with respect to the balance.

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Stock, the magnum pistons and pins are about 134 grams lighter than the LA's. The rings are lighter too. But with the aftermarket pistons installed, the weight difference is probably closer. It will be interesting to weigh them after tearing down the 5.9.
Otherwise, the magnum and LA pistons have the same general dimensions. The assembly will have to be re-balanced.