 Several colossal heads have been loaned to temporary exhibitions abroad ; San Lorenzo Colossal Head 6 was loaned to the Metropolitan Museum of Art in New York in 1970 . San Lorenzo colossal heads 4 and 8 were lent to the Olmec Art of Ancient Mexico exhibition in the National Gallery of Art , Washington , D.C. that ran from 30 June to 20 October 1996 . San Lorenzo Head 4 was again loaned in 2005 , this time to the de Young Museum in San Francisco . The de Young Museum was loaned San Lorenzo colossal heads 5 and 9 for its Olmec : Colossal Masterworks of Ancient Mexico exhibition , which ran from 19 February to 8 May 2011 . 
