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Like title stAtes. So the 4200 is 68cc. This is to be believed by me and my parts source to be an OEM factory overbore kit. It has the same markings as the 5400 builder head i just posted. The bore size on this is shown in pics and would take the 4200 from 68cc to 77cc. This head we believe is also a direct swap to the 5400 builder i posted as well. Both saws have the same stroke. Lets say $125 FnF or add 3% plus shipping. Also open to husky and jred trades.