2. Shaft (1964-71 and mid 73-74) vs. bridged rocker arms (all other years). Shaft systems have a passage in the block to oil the shaft. Bridged systems oil the rockers through the pushrods. A bridged rocker head can be put on a shaft block as the head gasket blocks the oil hole. Just remember to change to hollow push rods! Mounting a shaft head on a bridged block would require an external oil line. The line as described in the TSB to fix an early six (64-65) oiling problem would work nicely, but there is no real reason to use a shaft head since late model 258 and 4.0L heads are readily/cheaply available. 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.<snip>
mhaas@xxxxxxx Cincinnati, OH http://www.mattsoldcars.com 1967 Rambler American wagon 1968 Rambler American sedan =============================================================== According to a February survey of Internet holdouts released by UCLA's Center for Communication Policy, people cite not having a computer as the No. 1 reason they won't go online.