I have the "first improved" 3.5 and 3.0 24 and a first improved 3.0 bolt in my junk bucket. The unthreaded space distance looks the same as the "2nd second improved" bolts in the photo above. The 3.0 24 valve and 3.5 DOHC had the same H.B.
They must have had a problem with the 1st improved bolt or maybe they are just making a couple bolts as a "fit all" for all the Chrys ,Hyundia, Kias and Diamantes out there.

Last edited by KrzyDav; 10/30/09 11:37 PM.