anyone used comp cams 828-16's

Yes you have to grind clearance for the buttons and link bars. Your going to see when you put them in that the link bars and buttons that hold them will hit the block and not let them fall in, not a lot of grinding but enough that you will want to clearence the block before you put it together. Comp told me that there where no clearence problems and no grinding " they lied " I had to take the engine back apart to fit the lifters. Good Luck!