Roger Long wrote:
It effects more than one engine brand.

The engine model with the worst reputation for being a lifter eater has low
CHT's, excellent oil flow to the heads, and a large oil cooler.

Here's an article that describes one possible cause of spalling in Lycoming engines:

http://www.prime-mover.com/Engines/Marvel/suicide.html

....and a list of related articles:

http://www.prime-mover.com/Engines/Marvel/index.html

There's lots of other good engine-related stuff at this site.

Mark/C182L