> Would a TSIO-550 be able to be run for two hours at 2700 RPM and 38 " MP

if I remember its rated at 350hp for up to 5min and 240hp continuous.

my IO-550 uses this chart:
http://lancair.net/lists/lml/Message/22800.html
but that's for 8.5:1 heads, and I think the TSIO is 7.5:1... (with everyone
now running 10:1 NA)

                Rob