Engine Carburetor Rebuild Kit For Proform and Holley HP 850-950 CFM 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, two 30cc accelerator pump diaphragms, a high flow 4 window size 4. 5 power valve, four non stick precision die cut gaskets for metering blocks, a non stick precision die cut gaskets for the main body throttle