If you need those, you're running a much bigger cam & roller rockers than I am on my bracket car & I don't need any spacers. I'm running a Comp .690 intake, .660 exhaust & Harlan Sharp roller lifters.
You must be running tall valve covers .
My HS adjusters would hit the baffles on DC chrome covers even using thick gaskets . .648 lift and 1.6 rockers.
