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There are 2 species - the Western and Eastern gorillas, and both species have silverback males. The larger of the two is the Eastern Gorilla. The maximum size of a male gorilla can be over 225 kg (500 lb) and 1.83 m (6 ft) in the wild, with much heavier weights recorded in captivity. (Although I can't find a decent reference to the recorded sizes either.)
The heaviest gorilla ever in captivity was N'gagi, who died at the San Diego Zoo in 1944. He was 5'7 and weighed 638 pounds! The largest gorilla ever recorded was 5 feet 9 inches tall and weighed 360 pounds.