Honda CR125 2005-2007 Phathead cylinder head kit Color:Blue 6cc (100+ octane)K53 - 38

6cc  (100+ octane)K53 - 38

4cc  (100+ octane)

4cc  (105+ octane)

5cc    110+

T350  25cc +3

Honda CR125 2005-2007 Phathead cylinder head kit Color:Blue 6cc (100+ octane)K53 - 38Honda CR125 Phathead cylinder head kit 2005 2007 Chamber selection: K10 Stock K11 9. 2cc (95+ octane) K12 8. 5cc (100+ octane) Phathead Kits include a head shell with one combustion chamber, two sets of o rings, cylinder head nuts, copper washers, some stickers for your bike and tool box and installation instructions.. Phathead cylinder heads are made of 6061 T6 billet aluminum. The material is stronger and transfers heat better than cast aluminum.