Stock Forged Pistons in 5.0's

Hey guys, correct me if I am wrong (which could very well be the case ), but didn't almost all 5.0 mustangs up until midway through 1992 have forged pistons in them? I cannot recall where I read or heard that. If so, is there any way you can tell what you have without ripping the motor apart? I have a 1992 and I was just curious as to what pistons were in my car. Is there any kind of code in the VIN or anything? Just wondering. Thanks in advance.