I think they will vary some, we have a set here that are 419gms. I don't mind running pistons a little lighter and you should probably blueprint the engine anyway so can balance the crank then. We do a kit for $1300 with gaskets and cylinder exchange so thats not a bad deal. There is an "R" kit or a standard 748/854 kit (flat top).
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Making Ducs fly since 1991
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