[Mr70]

Chuck
It looks like it's either from a Chevelle or Nova Originally.
It looks like a Willow Run plant,showing just \ for the begining of the W.
If that's not it,it would have to be the letter,A or B or F or K or L.But I would lean towards L,as I've seen more Van Nuys L stamped down by the Oil filter out of those plant letters I mentioned,but it doesn't look like an L to me.