Another question, still Evolution, but not gasoline: I have the .61NT, and like it a lot. However, will a .61NX head work on it to make the engine a .61NX? Comparing the parts lists for the two engines it seems the head is only one with a different part number. The NX head is higher compression, right? Still use the same plug and fuel? Thanks.

Richard/Club Saito #635, Saito .100, .120. 130T, 180/Evolution .36, .46, .61