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Holley carburetor vacuum secondary metering plate screws

Kern Dog

Kern Dog

Life is full of turns. Build your car to handle.
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Hello,
Where do you find a tool to remove these weird screws? They have a strange pattern that no hardware store seems to have. I just left a Speed Shop where the clerk said it is no longer being made. I have tried to remove these screws before using a standard screwdriver and have deformed the screws.
Thanks.
 
Sometimes they come in those kits with a hundred different bits.. but I just modify an old flat blade to fit
 
Thanks.
I remember seeing a screwdriver that had that pattern on the end. I want that. Holley used to offer a handle with a fuel jet pattern in the end, I never bought one because a flat blade screwdriver worked fine. I have two 600 CFM vacuum secondary carburetors and a 750 that I’d like to go through. The 600s both have screws that won’t budge with a flat blade screwdriver. I prefer one with the tip cast into the shaft since the ones with removable tips are prone to losing the tips.
 
Last edited:
Clutch head is what you need as mentioned. Don’t know where to buy. I think I bought mine from Snap-On like 40 years ago.
 
They sell clutch drive bits you can put in your screwdriver.
There are several sizes out there so have a sample screw with you.
Snap on tool truck is a great source.
 
Got mine at Menards in a magnetic screw driver and bits as a set. I’ll go out and manufactures name
 
R413 said:
They sell clutch drive bits you can put in your screwdriver.
There are several sizes out there so have a sample screw with you.
Snap on tool truck is a great source.
Click to expand...
I realize that you are trying to help but......
If I could remove a screw to take it in to match it up, I would not need this tool.

I made an order for this:

1759358616579.png
 
Maybe so.
I am reminded of that meme that shows a picture of all different screw tip patterns and claims that Standard and Phillips are actual screws and that the other 20 patterns are mental disorders.



I found it!

1759365669852.png
 
5/32 clutchhead if memory is correct on size. I've had a driver just for that since the mid 70's. Still need it sometimes.
 
Late to the party, but when I had to rebuild the Holley that came with my stang back in the day I was able to use one side of the tips of needle nose pliers to unscrew them. Not correct but it worked and I had to get the car fixed to get to work that night.
 
In 1981 I turned 16. I had Dad's tool kit. Three screwdrivers, a hammer and pliers.
I've been able to remove the screws with a flat blade screwdriver before but not on these 2 600 CFM carbs I have here.
 
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