Paul,
         Finally got the exhaust back together and gave the engine a work out and am very pleased with the results.  Static run at a fairly cool 20 degrees C which is somewhere near the 60 degrees far. ( a guess)   With flaps closed the engine and oil just got over 180 degrees at full noise.  At that rate I will handle summer temps well, up to 45 degrees C.  Max rpm at static was somewhere around 6300 and if I richen the mix I get over 6400 plus, nearly 6500.  Egt gets up to 1800 and barely over, so the modified manifold has dropped that around 200 degrees as Mark said.  Oil pressure good, from 90 psi at cold down to 75 psi at 180 degrees. Engine runs very nicely, very pleased with it, held full noise for 10 minutes. Engine mapping complete but not perfect probably never will.
   Now the bad bit.  At full noise I was getting hot vapour into the cab and checked the fuse immediately after shut down, and could not hold my hand on the fuse (fibreglass).  Will have to install a heat barrier.  What options do I have??  Need a strip about 4 feet long to get past the mufflers and possibly 15 inches wide.  Prefer to mount onto the pipes and not the fuse, but at the end of the day, Whatever works best.  Suggestions??  Neil.

There is stuff called fiberfrax. Used with a thin layer SS. But it has to
go on the fuse. The SS reflects a lot of heat because radiation from
the pipe is the main cause of heating adjacent surfaces. The other thing
about SS is it does not conduct heat well. That is a good thing.

http://www.fiberfrax.com/


In the air it won't be so bad due to cooling flow. 10 minutes stationary full chat is worst case.


Paul Lamar