Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 154Get this manual
POWER UNIT
Intake manifold seating faces distortion Measure the intake manifold seating faces distortion09900-20803: Thickness gauge Straight gauge Service limit: 0.10 mm (0.004 in) If the measurement exceeds the service limit, resurface or replace the cylinder head