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Honda CR250 1992-1996 Phathead cylinder head kit Chamber selection:H33 - 18.5cc (105+ octane) 9cc 100+ octaneHonda CR250 Phathead cylinder head kit 1992 1996 Chamber selection: H30 21. 8cc Stock H31 20. 6cc 95+ octane H32 19. 7cc 100+ octane H33 18. 5cc 105+ octane H34 17. 4cc 110+ 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