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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 in captivity was a male of the mountain race names 'N' gagi, who died in San Diego Zoo, California, USA on 12 January 1944 at the age of 18. He weighed 310 kg 638 lb at his heaviest 1943. He was 1.72 m 5ft 7> in tall and boasted a record chest measurement of 198 cm 78 in. UK Britain's largest captive gorilla is probably 'Djoum' of Howletts Zoo, Kent, whose weight is stable at 213 kg 470 lb.