I have one or two TeeDee that I went TOO far with the ventrui size....they will only run on bladder

crank case off the front or off the back plate has ALWAYS been a problem for me to needle even with Texas Timers fine thread...but pressure bladder ALWAYS works

I run ONLY Galbreath heads and Nelson Plugs...

I ONLY use red cap or Texas Time Tubing bladder

I can start and run any TeeDee with this set up reliably

I have never got a good full tank run from a crank pressure set up no matter what venturi diameter I tried

I NEVER found cylinder shims to make any better RPM ( trying to align exhaust ports)

The only reason in my opinion to use cylinder shims would be to eliminate SPI of a muffler....... I do nor use mufflers and I have spent hours trying to get exhaust ports aligned to no apparent increase in RPM