Just replacing the exhaust manifold with new on my 23, old one warped. Using Langs 2 piece gaskets and rings. The clamps now do not have room for more than 2-3 threads of the nut. If I turn the clamps over there is not enough thread on the stud to tighten. What am I doing wrong? Should I use washers as spacers?
Sounds like you have studs and clamps mismatched.
I am not following your thought to add washers? If you don't have enough thread now how would washers help? If the old setup worked then the new one should fit the same or have you changed more then just the exhaust manifold?
Do you mean the studs are now too long and the nuts won't turn down far enough?
Yes the studs seem to be too short and the nuts only turn on about 2-3 turns. I only replace the exhaust manifold with new gaskets. If I turn the clamps over they go on too far, past the threads and I wonder if I should put washers under the nut to space it so I can tighten the nuts?
I sure wouldn't put the clamps on backwards, and I doubt that the studs shrank while you had the manifold off. If they were long enough with the stock gaskets before, they should be long enough now. I suspect you may have the manifold slightly misaligned so the rings aren't fitting into the holes. It's an easy mistake to make. You can probably guess how I know that.
One clamp is a little differ than the others and this one I can get a full nut on. I think they where like this before with maybe a half a nut on each.
The Ford parts book shows only one part number for the clamp, but there are two versions. 1909-1923 and 1924-1927. You could post a good picture in the classified ads showing the one that fits. It shouldn't be too hard to get matching ones. You can also get them from Lang's, and probably from some of the other dealers too.
Two different clamps, the early one has pads on each end and straight arms. The later '24-'27 are the 'recessed clamps', they have lug shaped pads.
The early uses a 3 1/4" stud. The later use 2 5/8" stud. The later clamps can be reversed and used on the longer studs. The early clamp has to have the long studs.
Later, mid '24-'27
I have the late style as Dan shows. I put them on as he shows and put 3 flat washers on each and torqued them to 20# then remove 1 at a time and turned them over. I now have about 3/4 nut of thread on each and they are retorqued to 20#. Do I need to torque them tighter? Thanks all.
20 ft-lbs ought to be enough, just check them after the engine has cooled down after the first 2-3 drives, they should settle down and hold their torque after that.