ORIGINAL: Lou Crane
...The only thing that annoyed me about the DDD .049 conversions was that a bit too hot, or overcompressed, might burn through the head seal - needing replacement before the next run. That was years ago, Bob D may have changed things since...
Lou,
That feature was one of the things Davis touted as an advantage of his head. The idea is that running over-compressed (and thus overheated) would blow the seal instead of your engine. Some like that feature, some don't. I do.
George