secondary plate to metering block converssion help - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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  #16 (permalink)  
Old 12-24-2008, 10:16 PM
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Throttle Plate #1

You will need to block the interconnecting fuel transfer track in the throttle plate. There are two tracks. You can fill it with a fuel resistant epoxy, like JB weld or you can block the slotted track with a steel plug or shot. What this does is seperate the track into two, the primary and the secondary.
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  #17 (permalink)  
Old 12-24-2008, 10:21 PM
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Throttle plate #2

Now you must fill the small hole below the fuel transfer slot in both secondary bores. You may or may not have these holes, if you do...fill em. It is the constant-feed idle discharge hole.
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Old 12-24-2008, 10:32 PM
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Throttle plate #3

Now comes the drilling. I forgot the bit size but these are very small hand held drill bits. You must drill this in the exact angle as the "red arrows" in the attached pictures. This drilled hole must intersect the vertical hole in the main body. Study the attached pics before you drill, as this is crucial and if done wrong, throw the plate away. Always think, measure twice, then when absolutely sure.......measure and think again, then finally take a chance and drill. If you make a mistake here, your throttle plate is rubbish.
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Old 12-24-2008, 10:45 PM
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Carb body#4

If you made it this far, pat yourself on the back, you're almost done. Now we can move onto the Carburetor body. You will need to drill through the bottom of the carb body so that you intersect the mixture screw channels in the metering plate. See attached pics, these are drilled at right angle intersections. Do not go too deep, you only want to intersect the channel already there. STUDY THE ATTACHED PICS, very carefully. Understand what you are attempting to do before you drill. Then study the pics some more until you are confident enough to drill.
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Old 12-24-2008, 11:02 PM
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Power valve plug #5

If you are confident of your work, you are basically done. You will need to run a power valve plug in this metering block as I did not describe how to modify your carb for a secondary power valve. Maybe in another "thread" I will. At times, you will need to change/adjust the vac secondary metering spring opening rate as vac secondary carbs do not have a secondary squirter.

You will need to clean the carburetor passages very well as there will be a ton of aluminum shavings all over the place. The shavings may even clog the idle mixture screws. If you think it's clean....guess what, clean the passages again.

Like I said at the beginning of this thread, I will not or am not responsible for anything that you did or will do to your carburetor to perform this modification. I'm simply helping my fellow hot rodders out with a simple example of a 4-corner idle mod. If this mod fails for you, I'm sorry. Go back and study the pics or buy yourself a Holley book and read. I have done this several times before and had never had an issue on my carbs. I'm not a Holley expert, just the average Hot Rodder that knows my carbs real well and am often asked to tune Holley designed carbs.

Good Luck and Merry Christmas!!!!
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