Compression Ratio for 350 Chevy Small Block
Calculate the compression ratio for a classic 350 Chevy small block with a 4.00-inch bore, 3.48-inch stroke, and 64cc combustion chamber.
How to use this tool
- Enter the cylinder bore diameter and stroke length in millimeters.
- Enter the combustion chamber (clearance) volume in cc from the cylinder head specs.
- The calculator returns swept volume and compression ratio.
The 350 Chevy small block is one of the most popular engines ever built — use this calculator to find its compression ratio based on your specific bore, stroke, and head chamber volume.
Frequently asked questions
- What is compression ratio?
- Compression ratio is the ratio of the cylinder volume at bottom dead center to the volume at top dead center. Higher ratios increase thermal efficiency but require higher-octane fuel.
- What compression ratio is best?
- Most naturally aspirated gasoline engines run 9:1 to 12:1. High-performance engines reach 13:1+. Diesel engines typically use 14:1 to 25:1 for compression ignition.