Chevy Big Block Heads Upgrade. Valve seat Cutter Set. Carbide Tipped 3 Angle Cut. 30 DEG 45 DEG 60 DEG. Milling in the following sizes. At 45 DEGREE + 90 DEGREE. 30 DEGREE + 90 DEGREE. Contents :- 6x cutters 30,45,60 DEGREE. 2.230 – 30 Degree Top Angle Cutter For Intake. 2.230 – 45 Degree Primary Base Angle Cutter For Intake. 2.125 – 60 Degree Inner (Throating) Angle Cutter For Intake. 1.880 – 30 Degree Top Angle Cutter For Exhaust. 1.880 – 45 Degree Primary Base Angle Cutter For Exhaust. 1.750 – 60 Degree Inner (Throating) Angle Cutter For Exhaust. 2x STEMS 11/32″, 3/8″, 5/16. 2x VALVE GUIDE HONE REAMERS 11/32″, 3/8″, 5/16.