Head - Honda GX160 Tech Manual

HEAD

Cylinder head will be in "as cast" and in factory machined condition and there must be no addition or subtraction of
metal or any other substance to the inside or outside of the cylinder head. This include no type of machining or grinding
to increase compression or airflow. No milling, angle milling etc. or any alteration that could increase valve spring
pressure. Note: Do not use abrasive material in cleaning head and cylinder deck that will alter factory finish. For Thailand
produced cylinder heads casting numbers ATA-3, ATA-6, TK1-10, TKI-11 other numbers to follow. Short Radius must
be sharp edged. Minor imperfections may be present on corner between cast port and machined bowl area (short radius)
The intent of this description is to prohibit any attempt to alter the cylinder head ports as received from the manufacturer.
See cylinder head photos.
A. Measure from flat of head surface down to valve seat. This dimension will be:
maximum 0.305"
B. Measure from surface of head to top of valve guide. This dimension will be: 1.010" Maximum
minimum 0.287"
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