Our HP rebuild kit for all Holley 4150 carburetors. Similar to our rk4150 except this kit comes WITH NOTCHED FLOAT AND JET EXTENSIONS, 1 POWER VALVE PLUG and .120 high flow needle and seats. This covers list numbers 4776 4777 4778 4779 4780 4781 and all HP model carburetors. All non stick gaskets 1high flow power valve, 2 30cc accelerator pumps, 1 50cc accelerator pump. This comes with float leveling instructions and mixture screw adjustment procedure.