Arnie talking about powerlifting from his reddit chat
"When I was gaining strength, I liked to warm up with 10,8,6,4 and then stay at 2 reps for five sets, and then back to 4, then 6, and then use the stripping method and just drop plates and keep doing 4 reps until I couldn't."
Arnold recommended 3 exercises for the chest in the powerlifting example he gave in his encyclopaedia
Bench press, Incline press, flys
Do warm up sets of 10 6 4 followed by 5 working sets of 2 reps
There was also an old article on how to get massive by using these concepts recommended by Arnold
Bench press, Incline press, flys
Chins, bent rows, Dumbbell rows, t bar rows
Shoulder press, press behind the neck, side raises
Squats, leg press, leg extensions, leg curls
Barbell curls, Dumbbell curls
Close grip press, pressdowns
Start with a 10 to 12 rep warm up then add weight each set in the following fashion 8, 6, 4, 3, 1, 1
Rest a few minutes between each set
Each set is a working set apart from the warm up
Keep to the same weight on the last 2 sets