So as I'm hooking these carburetors together with the nitrous plates, the spacers seem just the very slightest not flat when I lay them on glass... Not but the very slightest but noticeable.. I will be sending them down nice and tight with gaskets.. also it seems when I put a little bit of pressure they seem to not rattle under glass.. I'm thinking because they're aluminum stretch a little bit and flatten out..?? I just have a lot of gaskets and things stacked up and need them to all seal nicely.. the two between the upper and lower plenum of the tunnel ram I bought new as I've used the ones on there several times taking it on and off. And there's the one's between the tunnel ram in the nitrous plate the one between the nitrous plate and the 2in riser the one between the two inch riser and the little thin plate at the street demon carb likes to have and then the gasket between that little plate in the carburetor LOL.. 10 gaskets LOL...