Has anyone tried using the Elgin roller tip rocker arms? I have been running the Comp Cams Magnum roller tip rockers but have had trouble with the pivot ball area turning blue. The Elgin rockers come with dichromite pivot balls and the rocker is black, like it is treated with something. This is in a USRA SBC hobby stock engine with EQ heads 9.5:1 compression and an aggressive solid camshaft.