Have a very nice SC in the shop at the moment with a freshly built 2lt, everything looks good except it had a knock, so we've pulled it down and split the case to find the cam thrust bearing is stuffed (pic). The rear (as in rear of bus) of the bearing has broken away as though the cam is being forced forward. Just wondering if anyone has seen this and knows what might cause it. The cam gears look aftermarket and my money is on them... Also have an issue with new bearings, the damaged one in the pic is your std steel backed white metal, but the new one we ordered is all alloy and feels like it would break if I sneezed on it. I really don't want to use it, it's just gonna come back in a few months with the same prob if I do. Are there any quality bearings around?