1967 400 Bird. Can someone tell me the correct way to install a new Manifold Heat Riser Flapper Coil Spring for Ram Air factory header or exhaust manifold, driver's side. I bought a new Manifold Heat Riser Flapper Coil Spring. It seems that no mater which way I put it on, it leave the flapper open. Seems to me when cold, the flapper should be closed when the temperature is at 50 degrees for a newly installed coil??

Also, for the coil stud, should there be a "C clip" or retainer on the end where the split stud has a indented collar?

As always, any help is appreciated.