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I looked up and found this to be the California Emissions manifold. There are two large holes in the manifold. One has a fitting and is capped and the other one is just a threaded hole. The engine runs but it does not have any low end power. The car is manual disc brake, 4-speed. Is there...

I'm replacing the headers on my 1970 340 HP with the correct manifolds. Regarding the 1/2 rounded (convex) spacers on the manifold bolts and studs, does the flat part go to the nut or the manifold?