Re: tohatsu 140 to 135tldi
Bill,
In theory, IF Tohatsu were to build that motor, you COULD buy all the bits for a conversion. BUT, I would never recommend that, due to costs for parts. For example, you could build any TLDI if you already owned the block; for that matter, you could even buy a new block. But the cost in parts alone would be much more than the cost of a new motor.
Just like you could build a whole car from parts. But that experiment was once done on paper, and the cost was something like 10x the cost of the complete car.