We will never know completely what took place at the time between Mr K, Charlie Strang and Edgar Rose only what is recalled. John Timmons has direct access to Charlie Strang, I will ask him to see what Charlie recalls about the 20H Hp vs the Hot Rod and if he has any factory dyno test papers hanging around.
Did find this thread by John Timmons over at Johns Merc site and includes letter on the 20H and the Hot Rod issues by Charlie Strang hope it opens to non members, no Hp numbers

http://johnsoldmercurysite.com/phpBB...php?f=9&t=7790