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It sounds like GM would have you throw away the entire car during every service procedure (in my experience with their products that might be wise). I mean, the oil plug has threads and a torque spec, right?
Header bolts are so under-worked anyhow (15ft-lbs of torque?) that any argument for metal fatigue (caused by harmonics or thermal expansion) or thread stretch is pretty absurd. I'd have to read the article or attend the class to make an engineering argument about their point, but in this limited case there is virtually no risk of issues resulting from a "failed" bolt. Corrosion kills exhaust hardware which is why I went with ARP stainless hardware when I put my headers on.
Usually when headers get loose all the time there are 2 main reasons: poor quality headers excessively expanding and contracting (thin flanges) working the bolts loose or cheap gaskets that are doing the same thing.
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Vehicle: 05 Roush Sold 69 FB a work in progress. 95 GT
Location: The Great North East
LOL, And crappy hardware!
Ive had stock factoy header bolts (used) snap. on retorque.
ARP could be a different story?
Just saying, From my experience.
Key hardware, Head, intake, exhaust ect should be replaced.
Do what ya want
2005 Roush Sport,SOLD
1969 Rust Back, Frame up Resto in progress. 351W, Worked C4, 9" BBK so far
1995 Saphire Blue GT, 5.0 stroker, Trick flow Heads, Intake, Cam,BBK 75mm TB, BBK EX
tr3550, Spec STG2, Eibach, Cobra brakes.
I know with Toyotas, you can reuse the bolts/studs but not any of the nuts in the exhaust system. Daughter had Paseo that kept blowing the exhaust gasket. Finally broke one of the studs and sent daughter for some new ones at the dealer as I set about removing the broken stud. While there, the parts man informed her not to reuse the nuts so she got new ones of those two. When I looked at the new nuts I noticed they weren't perfectly round - slightly oval. Running them over the studs, which are round, causes interference and keeps them from loosening.
Never had another blown exhaust gasket after that.
2013 Race Red GT w / Brembo brakes
MGW Shifter, Borla Touring Axle Backs
AM Gas Spring Hood lift kit
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