Small Block Chevy Heads VALVE SEAT CUTTER KIT 3 ANGLE CUT CARBIDE TIPPED 1.940. VALVE SEAT RESTORATION KIT. CARBIDE TIPPED 14 PCS. Small Block Chevy Heads. 3 ANGLE CUT AS OEM VALVE SEAT. 3 x 1.940 30, 45 & 60 Degree for Intake. 3 x 1.660 30, 45 & 60 Degree for Exhaust. 11/32 VALVE GUIDE REAMER HSS. 11/32 VALVE GUIDE STEM. T – HANDEL & DRIVE ROD. Track Page Views With.