Richard, I checked out my 5 .40FP's in the shop. All of them have the look of the engine on the right. I don't think I have ever checked out the other .40FP's running at contests here in the NW, but I am wiling to bet the difference in graphics is simply a factory change on the case from one batch to another. I also am willing to offer that neither is more powerful than the other.  Glad to see that you are going to run what we feel is the best Carrier event ever to come down the pike.  Marc Warwashanna told me of your plans a few weeks ago and I was pleased. Have FUN, the NW Sport .40 Profile event, for all intents, is the only Profile Carrier event we fly now. Be sure to keep oit as thee rules are intended and you can't go wrong.
Joe

The engine on the right has a cast iron piston it's the early version and on the test stand is not quite as strong as the other with the same fuel and prop, both are swap meet finds and look like little use on both engines.

We are sticking to the N.W. Rules as they are simple and easy to enforce, we have having a meeting with the four clubs involved with the Tour de Michigan in a couple of weeks to set the dates and events and to see how many planes are under construction. I know of six so far for sure being built.

. Rich.