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Has anyone used these. I want to use them on New style Vortec Heads. I have the factory aluminum valve covers and the drivers side roller rockers are hitting the cover. I know I might be able to grind out the aluminum to make clearance, but I am thinking of trying spacers.
Let's say (for now) I don't have any bad things to say about spacers. I'm running a Gen 1 sbc with Edelbrock aluminum heads, the B & B spacers and stock (black) Vette valve covers. I also used the blue Fel-Pro gaskets on both side of the spacer. I don't have leaks, but then I don't have a lot of miles (500) on them either.
The previous owner had tried the double-gasket trick and it left oil all over everything..... definetly NOT the way to go.