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910-0646 100" SIDEWINDER BIG BORE KIT FOR 1999-'06 HD® BIG TWIN MODELS - WRINKLE BLACK 910-0646 rocker arm orders to California will beS&S CYCLE910 0646 Inspired by our Pro Stock Drag Race engines, these updated big bore kit utilizes a Ductile Cast Iron liner wrapped in cast aluminum for optimum thermal conductivity and performance. Bolt in kits do not require machining, rebalancing or engine removal, and include just about everything you'll need to complete the installation. The biggest cylinder bore that can be installed in a stock crankcase without machining! Features & Benefits