This Arctic Cat 580cc R (triple exhaust port) cylinder is re-plated to stock specs with a lifetime plating warranty by the plating shop. It is the standard 75.4mm bore. There is no core exchange required on this cylinder. We do have used cylinder heads as well. Shipping is only in the lower 48; unless you are purchasing through eBay's Global Shipping Program. If you are in Alaska please contact me before purchasing to check on shipping options. Thanks, -Paul