Services › CZ250 or CZ400 Head Re-Dome Image 1 of 1 CZ250 or CZ400 Head Re-Dome $85.00 Semi-Hemi- This modification changes the Squish-Band and combustion chamber head volume for broader power and cooling. Quantity: Add To Cart Added! Semi-Hemi- This modification changes the Squish-Band and combustion chamber head volume for broader power and cooling.