Hi 50, The big case Fox .45 is a real power house and can be used for CL satisfactorly. Keep in mind that it is not a 4-2 engine and run it with low pitch and you will find it does a good job.  You can add a head shim or two to tame it a little. When that engine was introduced, Duke Fox was aiming his products at FAI and most every thing was over compressed. I run mine on FAI fuel and with one additional head shim and they do just fine.  Prop it with a 12 x 4 to start with and work from there to get the lap times that you want.   Phil

HI Tony,

Like Brother Phil said, they will work fine, stock, as long as you don't expect a 4-2 run.  A lot of good engines came out at a time when stunt was still being ruled by the "Classic 4-2 style" enginew run, so they were cast aside when they wouldn't do that.

There are plenty of great engine guys who can get the 4-2 run out of them, and usually with plenty of power left for our purposes.  But a "low" pitch prop, and a soft 2 stroke needle setting will work in most all cases.  Some better than others, but all fine for "Sunday" flying.

Big Bear