Or as @STAGE III would say Satinous Gloss?? I'm thinking Satin but with all the dirt and grime I removed it's too hard to say how they started life...
What year? My memory is GM used gloss in the 50's and earlier, but changed to satin or flat sometime in the 60's.
Late 60's, early 70's They were more gloss than satin. They are one of the glossier things under the hood. How much gloss? Maybe 80-85%. I get my underhood gloss from spray paints at varying distances. Like a 70 GS aircleaner is 100% gloss, using the same can you just spray it from further away.
This board is a wealth of knowledge! Thanks for all the info. I have a coulple of coats of flat on them already so now I just need to top coat with "70% gloss".