NEW YORK — A massive six-hour blaze tore through a dim sum restaurant in Manhattan’s Chinatown, leaving six firefighters injured, New York City Fire Department officials said Sunday. The blaze erupted inside Dim Sum Palace on Chatham Square near the Bowery at 11:45 p.m. Saturday, FDNY Assistant Chief Tom Currao said. “When the first units arrived they were faced with a very heavy fire on the first floor, Currao said. “There was a tremendous amount of fire.” FDNY units proceeded with an exterior operation, where they doused the building down using multiple hoses and tower ladders. The fire quic…