Originally Posted by TX512
so basically your saying modern oil sucks.
In regard to flat tappet cams yes, but in many other ways it is so much better. The molecules are stronger, they take a lot more heat before breaking down, they provide better lubrication with less viscosity so drag from running the oil pump and resistance inside the bearings is reduced which provides more power on the end of the crankshaft, they make a lot less sludge than old oils.
But these new formulation oils don't work as well in the flat tappet interface. For production engines we're now 25 years away from starting down this path of replacing FTs with rollers, if it wasn't for the nearly 1 billion flat tappet SBC's that were produced over nearly 50 years, most of which are still out there, this wouldn't be a problem. But the engine persists and so does its flat tappet cam, but technology has marched on, in case you haven't come up against a stock LS7 yet, if you do you'll find it takes a damn well built Gen I to keep close.