Mercury 857138r1 Cylinder Head Instruction Manual
Mercury 857138r1 Cylinder Head Specifications VALVE SPRING Free Length (Intake/Exhaust) “a”Tilt Limit “b” (Intake/Exhaust)4/5 (1999)4/5/6 (2000 & Newer)Compressed Pressure (Installed)Intake/Exhaust:Closed Height 0.965 in. (24.4 mm) 4/5 (1999 & 2000) 6 (2000) 4/5/6 (2001 & Newer)Open Height 0.709 in. (17.4 mm)…