Thread: Header nuts & bolt, size? Thread pitch?

Sometime over the years, these parts disappeared on me. I've found four of the seven nuts for the header, at least I'm assuming they are from the header, but I'm missing three nuts. And apparently the lower fastener near the transmission is actually a bolt? Or did I somehow back out a stud when this was originally removed?

Looking for size info, thread pitch, and hopefully bolt length for that missing fastener so I can pick up replacements.

Answering my own question. Checked the FSM, looks like it should have been a stud there, I guess it backed out when the header was removed. I had a similar bolt and it seemed to thread in OK but was too long, so I think the threads are OK.

Size is an M10-1.25 x 40mm stud, Dorman Part 03105. I haven't come across a link to the Nissan part # yet.

Here's one option. I got a lot of these sets to use on my motor. I haven't installed the header set yet, because I plan on buying a new header soon.

SR20 FWD - Autotech Motoring

Sorry you had to answer your own question here. Good info.
I got a stainless set from Enjuku Racing a while back when I was missing some. I've since moved back to stock and prefer it that way. Mainly because stock aren't locking washers, and the Enjuku set was (which caused the studs to back out way too often upon removal). Don't forget the anti-seize.

These studs coming out seem to be a very common issue from what I've read. The new engine had one missing (header was removed before I got there), and my old engine had two studs gone from the header I pulled off. I think I should be able to salvage several of the old stock studs for use later if I need them.

On the anti-seize, couldn't that cause the nuts to loosen too easily, they aren't torqued that tightly per the FSM.

I know i have these.....

Thread courtesy Kyle:

http://www.sr20-forum.com/information-library/73322-oem-exhaust-manifold-hardware-studs-nuts-washers-photos.html#post1047361

I've never heard of an exhaust manifold nut backing off. I've heard of a bazillion that have seized to the stud. Your call.

I don't know what the FSM calls for (40 ft-lbs?) but I do close to 75 ft-lbs on them (by feel anyway).

OK, anti-sieze it is next time around. The FSM calls for 27-35 foot pounds. 75 seems a bit much, I don't usually bother to use a torque wrench on anything that low usually.

I bought my exhaust studs from NAPA...I'll check to see if there is a PN. I still have a couple if you are in dire need.