[Walt Fricke]

Finally waking up, I e-mailed TWM. They have butterflies and shafts, but:

"I don't believe you can rebore the throttles. This is because the injector pocket is positioned differently on every bore size and boring the bodies will leave a long oval hole which will not seal at the injector."

I'm going to have to look more closely into this, but this is something which makes sense and which I hadn't thought about. If what he is saying is that the injector is located farther out on a larger bore TB, then maybe the fuel rail position also changes?

My machinist may have a way around it. Possibly even doing some welding and re-machining.

The TWM guy opined that I'd be money ahead just buying new ones. I'm going to ask if I can buy naked but machined castings. The TBs are around $1,600, and I can get a lot of machining done for that. The boring doesn't sound like it would take a whole lot of setup time: line it up on the table on your mill, crank first bore under the boring bar, get centered, bore, move table (now lined up) to next one, center, etc. But I am hardly a skilled machinist.

So, Rob, I'll keep you in mind. But you need the whole shebang from air filters down to manifolds. I only need larger TBs - and want to keep all of the rest, excepting maybe the manifolds.