Magnum valve cover?

I went to pick a part today to pull off a dash, While I was lookin around all the different mazda's they had I noticed something I haven't seen or heard mention of before, I saw a valve cover that had the writing "magnum" on it. has anyone else heard about this? I think the truck was an 86.

dunno might be one off of a dodge d50

i've seem em , but have no idea if the motors diffrent