Pork is bad for you. Don't waste your time with pork.
The best way to build a big chest is with the dumbbell bench press, dumbbell pullovers, and some sort of fly movement. Don't ever worry about the weight you use for cable flys. It's more important to get a pump from them than it is to tear up more muscle fiber. Do your dumbbell flys with maybe 30 degrees of bend in your elbows or whatever feels natural. Try to get to the point where you use about the same weight that you do with dumbbell curls (if you're doing dumbbell curls with good form)
Dumbbell Bench Press and Pullovers are far more important than any fly movement, but just including a fly movement to get that extra blood in at the end of the workout might be worth your time.
And you can only make your chest bigger if you're making your shoulders bigger and your back bigger. Try to make your back absurdly strong and your chest will respond.