My 615x heads were angle milled to 13.5 degrees and 3 step head studs were used by the previous owner. I will be running a lot of compression like 16.5, and am concerned about the sealing potential of these studs. If I can clearance the stud holes to fit 7/16 studs should I, or will I not have a problem with the step studs?? I am concerned about clearancing and getting close to the o-rings in the heads is why I am hesitant. Any input is appreciated.