VALVE SEAT RESTORATION KIT. Small Block Chevy 350 Heads. 3 ANGLE CUT AS OEM VALVE SEAT. 3 x 1.940 30, 45 & 60 Degree for Intake. 1.500 30, 45 & 60 Degree for Exhaust. 5/16″, 3/8″, 11/32 VALVE GUIDE REAMER HSS. 1x TAP 1/2” UNF. PLEASE FEEL FREE TO ASK ANY QUESTIONS.