Golf club heads and methods to manufacture golf club heads

A golf club head comprising:

• a hollow body portion having a volume of less than or equal to 100 cubic centimeters, the hollow body portion comprising an interior portion, an exterior portion, a first material having a first density, a toe portion with a toe portion edge, a heel portion with a heel portion edge, a front portion including a face portion, a back portion with a back wall portion, a top portion with a top portion edge, and a sole portion with a sole portion edge, the back wall portion comprising:
• a port connecting the exterior portion to the interior portion;
• a mass portion coupled to an interior side of the back wall portion at or proximate to the toe portion edge, the mass portion comprising a second material having a second density greater than the first density;
• and
• a plurality of groove portions radially arranged on the back wall portion, each groove portion of the plurality of groove portions extending outward from a location on the back wall portion at or proximate to the port to a location proximate to a periphery of the hollow body portion,
• wherein at least one groove portion of the plurality of groove portions extends between the port and the mass portion, and
• wherein a groove portion depth or a groove portion width of at least one groove portion of the plurality of groove portions varies along a groove portion length of the at least one groove portion.

An iron-type golf club comprising:

• a shaft having a first end and a second end;
• a grip coupled to the first end;
• and
• a golf club head coupled to the second end, the golf club head comprising:
• a mass portion;
• a hollow body portion comprising an interior portion, an exterior portion, a toe portion with a toe portion edge, a heel portion with a heel portion edge, a front portion, a back portion with a back wall portion, a top portion with a top portion edge, and a sole portion with a sole portion edge, the back wall portion comprising:
• a first port connecting the exterior portion to the interior portion;
• a second port defined by a recess on an interior side of the back wall portion at or proximate to the toe portion edge, the second port configured to receive the mass portion;
• a third port connecting the exterior portion to the interior portion;
• and
• a plurality of groove portions radially arranged on the back wall portion, each groove portion of the plurality of groove portions extending outward from a location on the back wall portion at or proximate to the first port to a location proximate to a periphery of the hollow body portion;
• a face portion coupled to the front portion;
• and
• a filler material in the hollow body portion, the filler material coupled to at least one of the back wall portion or the face portion,
• wherein at least one groove portion of the plurality of groove portions extends between the first port and the mass portion, and
• wherein a groove portion depth of at least one groove portion of the plurality of groove portions is greater than or equal to 0.003 inch (0.076 mm) and less than or equal to 0.030 inch (0.762 mm).