[TransAm 474]

Ok .... to follow up on this thread, we pulled the new SMI Carb apart and measured everything in it. Here are the specs ....

#17084231 Q-Jet

Jet- 74
Primary Rod- 52M
Secondary Rod- DA
Secondary Rod Hanger- H
Main Air Bleed- .086"
Upper Idle Air Bleed- .067"
Lower Idle Air Bleed- .076"
Idle Tube- .038"
Down Channel Restrictor- .055"
Mixture Screw Holes- .093"
Idle Bypass- Plugged in Main Body with aluminum plugs, .083" holes drilled in Primary throttle blades
Fuel Inlet Needle & Seat- .130" (windowed)

Now.... I have been in conversation with Cliff, and we are making several changes to it with one of Cliff's HP Kits to try to correct it, here is what it will look like after making the changes ....

Jet- 76(was 74)
Primary Rod- 50C (Cliffs custom Smooth Taper) was 52M
Secondary Rod- DA
Secondary Hanger- H
Main Air Bleed- .086"
Upper Idle Air Bleed- .067"
Lower Idle Air Bleed- Reduced to .063"(was .076")
Idle Tube- .038"
Down Channel Restrictor- .055"
Mixture Screw Holes- .089"(was .093)
Idle Bypass- Now .110"(was .083")(changed Baseplate out for another with Solid Primary Blades, Removed Plugs from Main Body, opened up Idle Bypass Holes in baseplate to .110")
Fuel Inlet Needle & Seat- .140" High Flow(Non-Windowed)(was .130" Windowed)

I will report back with the results as soon as we get it back together and running .... Thanks to all for the help and suggestions, it is very much appreciated!