Just replaced a flat tapped cam with a roller assembly (long story, see other thread). Now I have a Comp Cams XR276 roller. My distributor is a Proform HEI unit. Summit's website here says the gear IS compatible with roller cams. Proform's website here says the gear IS NOT compatible with roller cams. In Comp Cam's forum I asked the question: which gear for this cam? I was told I needed an Mealonized Iron gear. Comp Cam's video here says that for a iron cam I need a Hardened Steel gear (or a composite $$$). I called Summit since I bought all this from them and asked what they recommend. They said I need a Bronze gear. I then sent an email to Comp Cam's with the above conflicting information and was told: So now I am completely lost. My distributor has a steel gear, but I don't know if it is hardened steel. Proform won't answer emails. One website says I can use it with roller cams, another website says no. Summit says I need a bronze gear (I'm going to ignore this recommendation). Comp Cams tech support says I need an Iron gear. Comp Cams video says I need a hardened steel gear. Comp Cams also says that some iron gears are called steel gears as long as they are not hardened steel (in contradiction to their video) and as long as I can test it on a Rockwell tester, it will work. I don't have a Rockwell tester...... :?