Well, the 4.0 head swap is a common Jeep swap. Less performance than a complete 4.0L swap as long as EFI is included, but if you don't want EFI for whatever reason (maybe racing) it does make sense. I have some documentation on the patent dispute somewhere, will have to find it! Not that production may not have been a contributing factor as well. On May 13, 2005 carmine@xxxxxxxxxxxxx wrote: > The reason AMC went back to shafts in mid 73 was due to a patent > dispute with GM over the bridged rocker design. I don't know how the > settlement was reached, but when it was AMC went back to a bridged > design for the 1975 model year. > > > > I remember the return to rocker shafts as being caused by the inability > for AMC to make enough stamped rocker arms. > > I don't remember if it was a failure of the machinery on the line > purchased for the new rockers or if the tooling was insufficent. > > Sorry this got by but I tend to ignore the whole "how can I do more work > at greater expense than swaping the the complete 4.0 to end up with > something with less performance thread" that keeps comming up. > > Can anyone add any info? > > Peter Marano > > Kenosha WI > > > > . > RSET ============================================================= Posted by wixList Archiver -- http://www.amxfiles.com/wixlist