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Old 02-20-2011, 05:27 PM
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Stock wheel studs to 1/2”-20, drill to fit?

I am changing the wheel studs on my 72 Chevelle to 3” long1/2”-20 studs to pass track inspection. The Chevelle currently has 7/16”-20 studs with a 0.472 knurl for the front hubs and 0.453 knurl for the back axles.
My problem is that the knurl size on the1/2”-20 studs is not going to fit at all, can I safely drill out the stud holes to accommodate the knurl size on the 1/2”-20 studs?

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Old 02-20-2011, 05:40 PM
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Can you use 3 inch 7/16 studs? Moroso makes press in 3 inch 7/16 studs that should fit your axles without modifications.
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Old 02-21-2011, 10:25 AM
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You funny guy...I just did that same exact thing to mine!! I have aftermarket axles so I had the holes drilled out and tapped and installed screw in wheel studs. Are your axles stock or aftermarket? Aftermarket axles have thicker flanges so it is recommended to use screw in wheel studs.

Actually 1/2" wheel studs aren't mandatory until you run 10.99 or quicker. I installed them because the seats on my wheels are completely worn out so I am going to buy some new Centerline wheels which have a thicker center section so I had to have 3" wheel studs and I figured that since I was already changing the wheel studs I might as well go with the 1/2".

Last edited by speedfreak2; 02-21-2011 at 10:48 AM.
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Old 02-21-2011, 06:26 PM
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I do have the Superior aftermarket axles in both the Chevelle and Camaro. Finding longer 7/16” wheel studs that will work without drilling the flange hole was not happening so if I figured if I have to drill them out I might as well install the bigger 1/2” wheel studs.
Right now the studs on both cars are about flush with the wheel, last year the IHRA tech almost did not let us run in the Nitro Jam.

Good to hear from ya Speedfreak2, what did you drill the flange holes out to for the 1/2” screw in studs?

I would imagine that I can purchase 1/2” screw in studs that will have a threaded area for the flange that will accommodate the over sized flange holes, once I drill them out for threading they will be larger than the 0.453 and 0.472 on the Chevelle, 0.453 and the front rotors on the Camaro are larger ….at work and can’t remember somewhere in the range of 0.542-0.565
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Old 02-21-2011, 08:59 PM
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ARP 100-7704 from Jegs. I had my machinist drill and Tap the axles. I installed the studs and torqued them myself. The trick to drilling and tapping is to make sure all of the holes are straight or parallel with each other. You will also need to enlarge the holes in the brake drum but that is the easy part. Let me know if you want the number to the machinist I used...I've known him for many years.
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