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I would use the cooking time for the 4 lb. roast and then figure you will have to add a little more time to that. Our cooking time charts show that you should be roasting for approximately 22 minutes a pound. I would start by checking the temperature of the roast after the 4 lb. roast cooking time and if not done, cook for another 15 minutes and check the temperature again. Check the temperature often to be sure the roast does not get over done for your liking. Be sure to take the roast out when it gets to a temperature that is about 10 degrees below your desired temperature. To cook it to rare, we suggest that it should be a finished temperature of 140 degrees, so you would remove it from the oven when its internal temperature reaches a 130 degrees. Then allow the roast to set for 15 minutes before carving. During this time the temperature will rise 5 to 10 degrees. Note: these times are for roasting at 350 degrees F.