As an aside - you know me - The Tower .40 ABC was better than the OS .40FP, when you got one made within spec. Quite a bit stronger and a nice little revver. I agree with staying toward the low side in prop diameter and pitch. A 9x6 to a 10x5 to an 11x4 are good prop sizes for this engine. You will not be able to over rev it with these prop sizes, even though it might make a pretty good howl while running the 9x6. There is nothing to hurt. This is a plain bearing engine with an ABC piston/liner. The latter is superior to the OS .40FP's later nickel plated liner. I'm also convinced that the timing of the Tower engine is a bit hotter than that of the OS .40FP.

I like the Tower .40 ABC engines so much that I have began to seek them out and collect them. No, they are not worth much on the market, but that is another reason that I look for them. The bargain factor.


Ed Cregger