I have heard that when replacing the jackshaft bearings, that the center one should NOT be replaced, that spot should remain vacant. Could it be that is more of a problem when an aluminum intake manifold is used or is it it just some odd idiocincracy of these cars? Wilkinson told me it could be because others don't have the "experience"...he has "done lots of them". I note that there are spacers between the clips and the bearings...I wonder if a wider one in the center (if available) might make a difference. I'm not against leaving that spot vacant but I'm just trying to figure the "why" of this.
I am also wondering what kind of bolts others have at either end of their jackshaft. I have the two centers as allen type that are two part, a threaded stud that screws into the part with the allen head having a short thick shaft threaded inside. The outers are standard long hex head bolts that are difficult to access with the jackshaft in the carrier. I intend to change those for allens as well but they will be the standard type as only the central two have the carrier designed for those unusual bolt types. Apparently the carrier was first bolted to the engine then the shaft was slid in while all was on an engine stand.