I'm planning on changing engines in my OMP FF540. Do you guys know which .46 - .51 size engines will interchange with the O.S. .46 without carving up the mounting rails too much? I swapped the O.S. with the TT 46 and MDS 48. The holes were fairly close and they fit between the rails. I was wondering if others like the Magnum 46, GMS 47, Tower 46, Webra 50, Evolution 46 etc. will fit fairly close? How many others are there that you have experience with that will fit closely to the O.S. .46? The next question would be; How many of them that will interchange can use the same muffler / header? I thought this would be good information to have while in the market for replacement engines. The motor length and height are not critical, mainly just the width and bolt patterns

Thanks much,

John Wells