This shows the amount of headspace that you may have and still get a proper seal.

ALTITUDE CHART
For Boiling Water Processing

If you are preserving at an altitude higher than 1,000 feet above sea level, adjust boiling water processing time as indicated.

ALTITUDE CHART
For Pressure Canning

If you are preserving at an altitude higher than 1,000 feet above sea level, adjust pressure pounds as indicated.