Mark,
I recall seeing head #1054 (if I recall) on ebay a few years ago; the high bid was about $4800, but did not meet the reserve. Pat Swanson contacted the seller. Did any of that information make the registry? Mine has been running for about three years now, and has not sprung a water leak. The final head repair by Bob Toros seems to have worked.
Here is a cutaway drawing of the intake and exhaust flow path of the Horning head. I still seem to be confused over the definition of downdraft angle and why the downdraft angle of the Horning head is not good. Based on various sources (e.g.,
Vizard,
Heywood, and others, the head looks pretty good. The spark plug location and combustion chamber shape are certainly not the best, however. The real chambers do not have as much quench as the artist's drawing shows.
