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Exhaust manifold bolts

I'll plan to use OEM bolts.

@denata could you explain that on the studs please? Do you mean something like an ARP stud that threads into the head and secures the manifold with a nut or do you mean studs as in using all studs like those needed for the passenger side manifold?
 
That's what I thought you meant. I like the idea. The disadvantage could be the ability to remove the manifold inside the engine bay. I'm not sure there's enough space for that in a truck chassis. Anyone else have input on this before I order some sort of fastener?
 
The OEM bolts aren't known to loosen up with heat cycles, I always heard the thread was different but I'm not sure.
Studs may work, may be difficult to remove the Mannie as you said, but I think they would work, at least you could re torque them.
 
I'd say another advantage of studs would be that if the nuts were to rust up and couldn't be broke loose you'd have the option of cutting them (the nuts)with a grinder to get them off. Without the risk of snapping off the shaft as happens with the bolts when you do this job.. just a opinion... when money allows I've gotta redo my manifolds, the leak, so this thread may also give me some guidance
 
I installed studs with M10x1.5 threads in the head and M10x1 on the nut side, I installed copper-plated nuts. The studs make it easy to position the manifold relative to the head; the walls of the exhaust manifold are very thin. When installing with bolts, you have to constantly move the manifold relative to the head, unscrewing each new bolt, trying to align the holes. In the case of studs, the collector is putin onto the studs, centered and no longer moves.
 
with a hairpin they were unscrewed evenly and tightly. Can't do it with your hands, with clamping pliers.
 
Can you measure the distance between the teeth on your bolt? You need to count 10 teeth and measure the distance between them. should be exactly 15mm, congratulations. But if it turns out to be almost 16mm (15.87mm) then this SAE ⅜-16 bolt will not fit.
 
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