If you want the .61, look at the Tower engine.

http://www.towerhobbies.com/products/towg0161.html

It has almost top power in the class, and has a true chromed bore that won't
wear out. Right now it comes with 6 free Tower glow plugs. (they are good)
If you buy it with the Tower Club deal, the warranty is extended to 4 years.
Tower has all the parts in stock, and the cost is half price of the others, plus
if you ever need parts....Tower ships the the same day to you for free.

The engine already has the "tuned muffler", and the main needle can be used
in the regular "front" position, or as a rear needle set-up. Look for a Tower
Savers Code, and get an additional $25.00 off a $150.00 order.

I wonder if Tower needs a salesman.

FBD.