Throttle Body Mods

• First, remove the air cleaner assy then disconnect the electrical imputs, throttle and 4 bolts that hold down the TB, it can now be removed to the shop bench.
  
• Notice that the bracket in the center for the air cleaner hold down blocks a 1/4-1/3 of each venturi. Remove this bracket and replace it later with a piece of threaded rod bent to align up with the air cleaner.
  
• Now the top of the TB has 1 inch tall nodules what I can only describe as Stonehenge blocks that line up the air cleaner. These need to come off, my way was in a vise with a hacksaw to remove the major parts of them (sounds crude "hacksaw the carb in half Joe...") Then I had access to a flat table grinder which most machine shops have. Have them mill the top of the TB flat till the Stonehenge blocks or Holley emblem just dissappear. Be sure to clean up with carb cleaner and air.
  
• If you decide to open the venturis as I did, then proceed to remove the butterflies which are connected each by 2 bolts with loctite. Opening the bores this way is in no way precise as a flow bench should be used to balance the air flow of both sides. I chose the unbalanced eyeball method of equal removal. I used an air dremel to open the upper half only (from the shaft to the top) and polished it with the wire wheel fitting and rouge compound afterward. I removed and contoured aproximately 1/8 of each venturi bore. I then R2'd the butterfly bolts with smoother hardware that recess into the shaft better.
  
• Before putting the butterflys back on, I milled them flatter on the flat bench then polished them the same way as the bores. I used loctite to secure the hardware on the shaft holding the butterflys. Clean the complete TB with compressed air and carb cleaner to ensure that no metal shavings remain. Pretty simple eh? Reinstall the TB and drive for a few hours to teach the SBEC it's new readings. I put my truck in 5th gear at 40mph and floored the throttle. When I did, it stumbled for air momentarily then pulled (air bogged). Next day, it didn't air bog but pulled only. As usual, if there are any questions, contact me at
  Kukukooter@aol.com.