Engine Carburetor Rebuild Kit Holley 450-780 CFM Vacuum Secondary Carburetors ProformIf you do not have hours to spend accumulating all these small parts, then the PROFORM performance rebuild kit is the perfect solution. The kit includes two size 110 machined needle and seat assemblies, needle and seat adjustment screws and nuts, an accelerator pump diaphragm, size 6. 5 power valve, vacuum diaphragm, two idle adjustment screws, six non stick precision die cut gaskets for metering blocks, six non stick precision die cut gaskets for the