i know its trivial, but every dollar counts right? i had to disassemble my literally 99% complete 370 because i did something dumb and was wondering if because the gaskets were torqued for a month or so it is necessary to replace them..
no copper spray or anything. none of the black sealer should have came off. I would use them on my stuff, but not a paying customer. I've reused GM MLS that had miles on them. re used comics with copper after cleaning them and re copper spray.
I made a dumb mistake with on my motor build and i had to tear the heads off too. They were torqued for a day or so and i re-used them. Then my buddy talked to a guy who works at a GM dealership (as if that matters) and said that as long as they haven't been heated up they are okay to re-use. Apparently the black stuff on the gaskets is a glue that seals them up and it is heat activated. I would re-use them if it were me.