I've been using Evans for 20 years. However, I've noticed that I have had several new heads with issues. One of the biggest issues is the aluminum rim. I have received heads where the rim is not circular. It is typically off were the seam/weld joint is located. Also when the ends are welded to gather they are misaligned. Evans was quick to replace them last time, but I'm putting heads on a brand new kit and I'm running into the same issue again. I would think that aluminum rim is critical to getting the head to seat correctly and tuning. Should I be concerned about this or just let it go?