Agreed, slotted rotors probably made no difference In this application but the caliper change was a dramatic improvement
CK5
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8 Lug 10 bolt front rotor source?
- Thread starter eodcoduto
- Start date
My concern with drilled rotors is always warpage going from hot to “cold” so quickly, especially on such a heavy vehicle. But those dont have tons of holes compared to some ive seen, so probably not an issue.
No doubt they look cool. Love the caliper upgrade, I’m sure well worth it!
No doubt they look cool. Love the caliper upgrade, I’m sure well worth it!
I couldn’t find them on summit but they can go on my list
As long as you don't exceed the max torque for the fastener I don't think you'll have issues. What I'm seeing, for 3/4 ton, is that they are 1/2" studs? (Edit: See below, 9/16)
Grade 8 max torque is around 120ft lbs from what I see online (depends where you look, Grade 5 is listed at 85ft lbs max). GM torque spec seems to be between 75-85ft lbs for 3/4 tons with 1/2" studs.
If you aren't using a torque wrench, no clue how you'd know if you were going over or not, and kind of need to know what grade GM spec'd. I don't recall if lug studs are marked like bolt heads or if there is an industry-accepted grade for all wheel studs.
1/2 ton is far lower of course (7/16"), 78ft lbs fastener max, *assuming* grade 8. But I think if you look up the GM torque spec for lug studs, the 1/2 ton are near the grade 8 limits so I'd hope they were actually using grade 8 lol. But that's not much torque for seating them IMO.
Funny how often impacts are used on lug studs (especially ones that have quite low torque limits), but we generally go nuts about not reusing things like leaf spring u-bolts.
Edit: I think 9/16 is right for 3/4 ton +. No idea why someone put out a chart showing 1/2". The numbers change to 172 ft lbs for grade 8, and 122 for grade 5. With those numbers I would expect GM to use grade 5, if the lug nut torque spec was near that.
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I’ll tell you what, when I’m torquing these 7/16” studded wheels, 80 ft. lbs. feels way too easy. 95 fells like I might hurt it. I like the way 90 feels. That’s what I’ve been using for a long time and seems to work great.
I suppose if you are cranking them by hand then you'd be pretty safe. Problem is, I bet most people do it with a 1/2" pneumatic impact which are rated anywhere from 500-1000 pounds of torque. The amount may well be trivial, as I said I have not done the research, but there's no way that doesn't damage the stud to some extent.
I misspoke in my earlier post, I purchased the rotors from rockauto.com
YH141049 From Advance. front rotors for an 86 k20. same rotors I used for my 14FF rear disc conversion.
