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So long story short I installed stainless tubular manifolds on my 3800 powered Buick over the weekend to compliment the intake and rocker arm mods.
Unfortunately ZZP didn’t quite get the grind on the crossover flange right so I had it on and off about 4 times trying to get the crossover to seal before saying f*** it and buying ultra copper RTV.
It did the job however in my haste and highly irritable state I mixed up two of the exhaust studs and crossthreaded one, possibly the other. Looking at pics of replacements it seems one has the threads cut at a different angle thus having a different thread per Inch count than thr other.
One went in with no issue but the other went in 2-3 turns by hand, I put a socket on the nut and hand turned it another 1-1.5 turns which I felt light resistance when doing so. I just overlooked it after being under the hood all weekend.
It went in the rest of the way fine.
However now I have a very small leak from the area where the bolt that went in easy as as can be and when I tried to re-torque upon finding the leak, the obviously crossthreaded bolt turned while the rest didn’t.
These are aluminum heads and I’m wondering if a carbide tap is worth purchasing or if I should save up the $$$ and have a shop helocoil the head since its going to need to come off in order to do so.
I don’t want to remove the one bolt and end up not being able to drive it until I fix the threads.
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And I did increase torque from 22 to 25 lb ft since I had reused the stainless gasket so many times. I may have damaged the threads even more than I initially did.
One last bit of info, the crossthreaded bolt only turned about 1/16th of a full turn before the wrench clicked. Not like it kept spinning around.
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