Carbon 14 dates were done on wood and rope. The dates for the wood had quite a large margin of error as cedar is very long lived.

Having written that I can't find a reference to actual results though I have read it somewhere.

I have a copy of "The Boat beneath the Pyramid" by Nancy Jenkins which is a very full account of the discovery etc but was published before Carbon 14 dating was common.

Jon

www.egyptarchive.co.uk