Compression Ratio Calculator
Calculate static compression ratio from bore, stroke, deck clearance, head gasket, piston dish/dome, and combustion chamber volume.
Units:Piston & chamber always in cc
Engine Dimensions
in
in
in
Head Gasket & Piston
in
in
cc
cc
Static Compression Ratio
9.03:1
Moderate — flexible for street performance and mild boost.
Swept Volume
716.6 cc
Deck Volume
4.53 cc
Gasket Volume
8.70 cc
Total Clearance
89.23 cc
Common Engine Presets
Notes
• Deck clearance is positive when the piston sits below the deck at TDC (most common).
• Piston dish or valve reliefs add clearance volume (positive cc). A dome subtracts it (negative cc).
• Use the compressed head gasket thickness, not the nominal thickness printed on the box.
• Gasket bore is typically the cylinder bore + 0.020"". If unknown, leave it equal to bore.