[b]Jim:

The biggest difference between a 40 and a 46 engine is a toss-up. Could be the snob appeal being able to say 46, or it could be just the price.

Price? Hobby People sells the Magnum XLS 40 for about $20 less than the LS 46, but all the parts except the sleeve, piston, and cylinder head interchange. Includiong the crankcase other than the "40" or "46" on the side. If there is any difference in the production cost, the 40 has to be the more expensive to produce as it has slightly more metal with the thicker cylinder wall.

There is not enough difference in the power for me to notice.

I have several Magnum 46 engines, but since I got my first XLS 40 engine I have bought no more Magnum 46s. Not worth the higher price, and the 40 is an excellent, powerful engine.

What I'm saying is, it will be time to go from the 40s to the 46s when they sell for the same price.

Bill.