Anyone know this off hand? Also, what about the manifold to downpipe studs?

Any help would be greatly appreciated. Thanks guys.

 

Figured it out.

Manifold to head: M8 x 1.25. 45mm long

Header to Downpipe: 3/8-16 . Unknown length. Probably 2 or 3 inches.

 

The stud holes in the manifold are standard thread, 3/8-16, or at least the ones i've seen are. Maybe the nuts on the DP side are metric, but if you are replacing the studs with bolts the manifold takes standard threads. The OEM studs might be different thread on both ends, I don't recall. I would have to look around for one I pulled out of something.

 

OK cool, thanks.

I actually am going to order the manifold reseal kit from CED. comes with the studs and nuts. Says the nuts are M10x1.5. They must be different sized on both ends.

Now that you mention it, I remember buying 3/8 bolts at Lowe's for the manifold back when. lol

 

I know they are that size because I always run a tap through the threads on the manifolds I clean and port, so the next guy doesn't have to. Removing the studs always seems to leave the threads in rough shape and full of crud.