David, gents

I know exactly how to optimize a carburetor system for that I did show the picture.

For me it does not matter the brands, only important are, reliability, characteristic, fuel consumption, fuel air ratio, throttle ability etc.
Why my post 13,

I only did read halleluiah stories see the posts x - 11, but probably all about a (new?) undisturbed carburetor.
That was why I did warn for second hand stuff without knowing where it is coming from, as dhal22 did write (and has a lot of?).

IMPORTANT

The educating came later, after I did post, see ual767, post :

The 7D carb came on the .61 FSR motors and the .61VF (rear exhaust). It had a removable sleeve inside the throttle barrel on the .61 that was removed when it was used on the larger .91 or 1.08 motors. The 7D was an excellent carb.


All (modern) carburetors are designed to combine with muffler pressure.
When you remove the carburetor insert, the sucking pressure will be less so throttle ability and fuel consumption maybe not as optimal as you wish. Finding back the insert after you is told this, is normally impossible.
I only enlarge a bore when I use a fuel pressure regulator, see the picture, maybe is a better advice.
ual767 also writes:

Oh, and it had nothing to do with an old beat up Taurus plane

Yes it has, Ed Kazmirski was one the pilots of who we can read he did modify the carburetor barrels (VECO45RC, Super Tigre).
I can tell you, the shape of a vertury has a lot to do with the recovery of the sucking pressure too so there is much more to tell!.

old beat up Taurus plane

The Taurus on the picture does have real time air speed control and data logging capability, show me yours!

Cees


Didn't see the two posts before this one because I was writing my post, so there are much more details important!!!!!