they work bro, just be careful not to over pinch, i used a pincher on a .28 i had, i had to use a heat gun to get it to turn over for the first time but once it was running, it was insane, you will have to break the engine in again but its better than out of the box because of the intense pinch you can give it but like i said, take your time and check after you do the 4 points, you can always go tighter.