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I'm finally getting around to making my to-do list for the sleds this year and I'm wondering what all I should be doing to my backup sled which is a 1996 670 summit with 7k miles on it. I have no clue when it was last done so I'm thinking a set of pistons may not be a bad idea. Everyone talks about putting the 501 rotary valve in. Is this strictly a performance thing or should the rotary valve be replaced every so often? Having 7k miles on it, I'm not interested in expensive mods, just keeping it running. Any ideas about parts that should be replaced???