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#1
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Rear wheel stud size on a street car with 500 HP or more???
I would assume the going to 1/2" on any car that has a 4-3/4" bolt circle (assuming they all use 7/16 stock). No brainer???
We have a couple of car events in my town. One has a cruise. A 67 or 68 Camaro performed a full throttle tap on the good old accelerator pedal. Half way down the block his huge right rear tire passed him going down the street. I only got to see it on a video. No telling why???
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#2
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I went to 1/2 studs but only because I bought Moser axles that were drilled for both sizes. I don’t know how necessary it really was.
For me, when I had to buy studs anyway, it really was a no brainer. I did have to take a drill to my brake rotors.
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1967 Firebird 462 580hp/590ftlbs 1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455 Owner/Creator Catfish Motorsports https://www.youtube.com/@CatfishMotorsports |
#3
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May have broke an axle.
We never broke any 7/16 studs, except on a dirt track car. I used some long aftermarket 7/16 studs on most of my 455 bracket cars. Used the stock 7/16 studs on our 12 sec 400 powered Stockers. BUT, it's been my experience that most everybody, especially tire shops, always get the lug nuts WAY too tight. My guess is that years of over-tightening the nuts can make the studs very susceptible to failure. Not real sure what the torque is supposed to be. But I suspect that most tire shops put WELL over 100lbs on 'em, with the impact wrench. I tighten all mine to feel, with a 4-way. Been doing it that way since the '50's. |
#4
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Will 1/2" studs fit through the holes in a stock wheel?
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#5
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Quote:
Did the studs break? Did the axle break? Were the lugs too tight? Were the lugs too loose? Were the wheels Uni-Lug? Were the lug holes "egged" shaped? Were the proper lugs being used? Were they low quality studs? Were the correct depth lug nuts being used? Were they low quality lug nuts? Were spacers being used? I'm sure I can think of more. I run ARP studs, McGard Tough-Nuts, Moser or Strange axles, would never run a spacer and torque my lugs periodically with a Snap-On torque wrench. Not once did I ever have a problem with 7/16" studs.. |
#6
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Most people keep running the 50 year old studs that have been torqued hundreds of times and wonder why they break. New quality 7/16" studs are fine for 90% of the street cars. 1/2" for the other 10%. If it was mine and it had some sticky tires and big HP- 1/2 studs. If it was a true street car with street tires 7/16 ARP.
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66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
#7
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PY Name...and 5" pattern on the rear rims.
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#8
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Lol, now we know!!!
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#9
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I ran 5/8" - surprised to see 7/16" recommended.
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#10
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I've see those 5/8 setups, they look stout! I won't be needing that..
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#11
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Yes
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#12
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For me the only downside to changing to 1/2" studs was having to tap threads in my aluminum front wheel hubs.
Peace of mind from the upgrade inspires confidence in action. It didn't really cost more in parts. Labor about $100.
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- Tom |
#13
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Unless you have FWD there is no need to change front studs. And yes 1/2" studs will fit stock wheels. I have them on my car.
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#14
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We've run OEM style 7/16 wheel studs into the nines on several heavy vehicles. The only studs we ever sheared were long (NHRA legal) aftermarket 7/16's.
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#15
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After a series of hot laps my son retorqued the wheels using a 4 way lug wrench on our sportsman stock car. A few minutes later we heard a Ping and then another ping. We looked at the left front hub and 2 studs were gone and they were laying about 3 or 4 feet away from the car. After that I instructed him to use the torque wrench.
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1979 Trans Am WS-6 .030 455 zero decked flat pistons 96 heads with SS valves 041 cam with Rhoads lifters 1.65 rockers RPM rods 800 Cliffs Q Jet on Holley Street Dominator ST-10 4 speed (3.42 first) w 2.73 rear gear __________________________________________________ _______________________________ 469th TFS Korat Thailand 1968-69 F-4E Muzzle 2 |
#16
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Yeah, it's real easy to get well over 100 lbs with a 4-way, if you apply enuff pressure. Some think they need to get 'em as tight as possible, so they won't back off.
According to this Summit chart, only 55-65 lbs is needed for 7/16 studs, & 75-85 for 1/2" studs. https://help.summitracing.com/app/an...l-installation Again, it's real easy to get over 100 lbs with a 4-way. If anyone wants to they can use a torque wrench & a 4-way to get a feel for the correct torque. Many of those who haven't done this will probably be surprised as to just how little effort is required to get more than 75 lbs. Last edited by ponyakr; 09-17-2019 at 09:17 AM. |
#17
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I asked Quick Perfomance about this since I wanted to use stock rims (Rally 2s) with their rear for street tires and slicks. They said stock size was good to 750hp.
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Chris D 69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60' |
#18
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There is probably a lot too what was said earlier about using 50 year old studs. Getting new good 7/16 studs is probably a good preventative measurement that doesn't cost much. I had a wheel come off that Im still not sure it was my fault or not. Replaced the studs after that. Luckily I was able to get off the road when I felt the wobble and it happened at a stand still.
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1967 Firebird 462 580hp/590ftlbs 1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455 Owner/Creator Catfish Motorsports https://www.youtube.com/@CatfishMotorsports |
#19
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Ha!!
K
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'63 LeMans Convertible '63 Grand Prix '65 GTO - original, unrestored, Dad was original owner, 5000 original mile Royal Pontiac factory racer '74 Chevelle - original owner, 9.85 @ 136 mph besthttp://www.superchevy.com/features/s...hevy-chevelle/ My Pontiac Story: http://forums.maxperformanceinc.com/...d.php?t=560524 "Intro from an old Assembly Plant Guy":http://67-72chevytrucks.com/vboard/s...d.php?t=342926 |
#20
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1/2" studs on dads car, and had to open the holes a bit on the stock steel wheels to fit. Stock size studs on everything else here. We also torque all wheels, unless I'm on the side of the road with a flat of course.
Never once have we had a problem with sheared studs. When I was much younger and didn't believe in using the torque wrench on wheels however, there were several instances I'd snap the stud right off the car with a lug wrench. |
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