I was wondering something. before I toss my head back on the car (came back from machine shop a bit ago). I was wondering if anyone could tell me if the mechanical rocker arms are different between intake and exhaust. As in, can they be interchanged. If not, can someone let me know how to tell which should be intake and which should be exhaust. I left the rocker assembly on when I took it to the shop, I just want to make sure it's right before I toss it in the car. As I hope to not have to pull anything else out of this car again for a long time