SigPiPup, if you want to get technicial.. the OS 46FX is lighter, has more power, its ABN construction vs the TT ABC construction, its double layered and more durable, and the plating process is more consistent, which results in better compression, and longer life. These are some points that the TT Pro 46 does not have.

Brian, I do agree with you 100%, the price does reflect more on the "name" than the performance. But the 46FX is a better built engine. Everyone has opinions. I would recommend the TT over the OS just because I own a couple TT engine... both are great, but if your looking to save some money, go with the TT, that what I did, and I dont regret it one bit, great engines.

.02

Besides, this is the wrong fourm for engine talk