Now a mention should be made (since the application in the first post was only for a C4 application that what I posted in Reply #10 was for 289 applications. For 302 4V application the same MPC list the service replacement (possibly the assembly line part also since production was still going on) as C8
Jeff: When did Ford start using the C6ZA-6068-A?
Don't know at the moment. By 68 the MPC had possibly combined 289 applications and shows the C5ZZ-6068-B for 289 2V & 4V and the -C for Hipos through mid 67 production (11/1/66)
So many cars have had their's replaced and so often we don't record or look for the casting/engineering number on the mounts (engine or transmissions)
Do have examples of 68 and 67's still using C4ZA marked ones but have seen and have pictures of the C6ZA ones just no records (VINs) of what cars they were removed from currently
Must have been some reason to go from the C4ZA to the C6ZA mounts but they look identical maybe the strength or durability of the rubber between the two.