i just googled arnold and powerlifting,in 1968 arnold competed in his last powermeet,the german powerlifting championships,he squatted 215 kilos which is close to 500# he benched 200 kilos which comes out to about 440# and he deadlifted 710#this was all done while he was still quite young and would say he got stronger,he just didnt max out for one rep after this.