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Union Bay 925 ski doo top end, bore is like new, no scatches, fresh honed. Head is 13.5:1. Cylinders where bolted on but ran very, very little then honed so like new, head brand new, never ran on this top end. Kit comes with monoblock cylinders and head with interchangable domes. No pistons with kit but they are available anywhere. offers, located in alberta canada