So dear Blis if i understand right you believe that i will go hot with N21-7T.
I had the hope that two slices of aluminium couldn't give such a big difference
Of course i haven't mind to run the engine richer in order not to get hot.
I want a well performed engine and not intermediate solutions.
I run Byron Race Gen2 25% nitro 11% oil.
I read a lot also at igtforum and some the guys there run some on road engines on GT2.
They didn't mentioned something about temperatures. On the other hand no one told that they were cool.
My last question was what if i replaced the head with another one from rally or from of road engine, as Roelof said.
The 4 holes at the head are the same at some Nova motors. I mean the pattern-distances of the holes.