As far a HP and torque on the Corvair engine check out the info from the
dyno tests that WW performed at FLYCORVAIR.com. Here is actual HP performance
figures on an engine (0-200) as it came off the airplane and the Corvair 110
as it came off the airplane. These are HP and torque at the prop and with
accessories. It shows the difference to HP derived from computation and
actual. The claim on my Revemaster 2100 was 80 HP but I never really believed
it.
I think that actual it was closer to 65 or 70. Torque is a big factor. The
Corvair has more torque on 5 cylinders than my VW 2100 turbo ever had.
Just food for thought. Bill