70-72 A body Front Wheel Disc Knurl Dia?

[online170]

I have a 71 Buick Skylark.

Im converting front brakes to a disc conversion, and i want to install longer studs to help with bigger and thicker wheels.

I cant find a PN for them. The options on summit and jegs appear to be for rear ends, and front drums only.

If you have a 70-72 A-body with factory front discs and extended wheel studs please chime in.

[Apogee]

I don't have a Skylark, however my notes seem to indicate that there were two stud possibilities that year, either a Dorman 610-105 or a 610-186. There may be a three-digit number on the head of the stud which would be the quickest way to determine what you have. If all of the studs are original, than they may or may not have the 3-digit number is not typically a requirement on original studs.

If you have the 610-186 studs, the 610-157 are a good overlength replacement stud that should work well for your needs.

Any reason you're not looking to increase the stud size at the same time?

Tobin
KORE3

[online170]

Damn i wish i check this forum more often.

I am putting bigger wheels on the car, and dont want to deal with modifying the wheel if i go up to a 1/2 in. Although the 1/2 screw ins are probably the best.

The front discs are actually new repos. I can check to see if there any numbers on them. They are probably for a chevelle, but i assume the stud sizes were the same for A-bodies for those years.

[MonzaRacer]

you should be able to use 1/2 20s on an a body wheel with no issue. GM actually sold parts for the mid 60s a body with 1/2 20 studs in 5 and 8 lug for circle track cars and they would fit pretty much any wheel out there,,,,sooo unless your wheels have some super thin shank lugs you should be able to swap out and go with typical 1/2 20 moroso studs, much better for strength anyway.

[online170]

PN for the fronts?

I guess it doesnt matter since they would be enlarged holes anyway right?

[CHILI442]

If you have a dorman 610-114 in there now, you can go with a 610-289, which is a 1/2" and a little over an 1/8" longer. The Knurl diameter is only .001" larger.

[online170]

If you have the 610-186 studs, the 610-157 are a good overlength replacement stud that should work well for your needs.


I bought a kit that someone was selling. It was listed as a disc brake kit for a 70-72 Chevelle.

The number stamped on the head of the studs is "V 752".

[Apogee]

"V 752" doesn't ring any bells with me, maybe it will with someone else. If you want to run 1/2-20 studs, you shouldn't have any trouble with your wheels so long as you get lug nuts to match. Most wheels use a 60 degree conical taper lug nut and oversized through hole on the wheel typically capable of accommodating an M14 or 9/16" wheel stud diameter without modification like Lee said above.

There are lots of 1/2-20 stud options, OE and aftermarket, but most will require some sort of modification to your rotors, whether that be drilling and tapping for screw-ins or drilling and reaming for the proper interference fit with press-in studs.

Tobin
KORE3

[online170]

I finally had the time to push the old studs out and measure. Caliper showed the knurl was .548 and the the hole was about .537.

So .560 aftermarket knurl would have worked.

What is the difference required for a good fit between knurl and bore? 0.01, 0.02, ...??? Ill be enlarging the bores myself, just need to pick the right drill size.

[Randy67]

I would recommend finding a reamer to enlarge the holes. My machinist friend did my hubs with a reamer for my 1/2" studs (3" long ARP studs, knurl was just over .6" if I remember right), it's more accurate that way from what he told and showed me. He did drill them close to size and then reamed them to final size. Pretty cool to get to help out and learn stuff.

[scottpreston]

I have a 71 Buick Skylark.

Im converting front brakes to a disc conversion, and i want to install longer studs to help with bigger and thicker wheels.

I cant find a PN for them. The options on summit and jegs appear to be for rear ends, and front drums only.

If you have a 70-72 A-body with factory front discs and extended wheel studs please chime in.

I know this is an old post, but it still comes up first in Google..

I found a solution. I have the same problem with the V752 studs, no replacement. I actually found out the best fit was a metric stud. I wrote a complete post here (http://www.scottschevelle.com/after-market-disc-brakes-wheel-studs/) detailing it. http://www.scottschevelle.com/after-market-disc-brakes-wheel-studs/