Admittedly, there are direct spray modifications available for the Lycoming
cam lobes--according to a bonafide Lycoming Bigot in my chapter

We're buying three Lyc Factory overhauls this spring (O-320) and the
dealer tells me that Lycoming has come up with a roller tappet and cam
to match. The case is different, to make room for the extra machinery.
It's an option right now, apparently. I imagine they'll try to convert
the fleet. The roller tappet is likely in response to scuffing issues.
We haven't had any problem with scuff for years, since we started using
an oil with the additive Lycoming recommends (Aeroshell 15W50).

Dan