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

I've thought for some time that roller tappets would be the real solution,
and I am glad to hear that they will be offered for the O-320.

If you're buying three, your equipment probably dosn't have excessive
periods of inactivity. It's also good to hear that the recommended oil
additive has resolved any residual scuffing problems up until now.

Peter