Sunny Hills Classic Cars

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AI advice only — not a substitute for a licensed mechanic or safety inspection.

Your Cars Compression Ratio

Pick a known hot-rod engine below to load factory (or standard stroker) bore & stroke. Chamber, gasket, deck, and dish still must match your heads and machine work. Manage engines in Settings → CR Calculator.

Cylinder bore diameter (in).
Crankshaft stroke (in).
Combustion chamber volume (cc).
Compressed thickness (in).
If unknown, leave blank (uses Bore).
Usually 1.
Piston-to-deck at TDC. Positive = piston below deck. Negative = piston above deck.
Dish adds volume (+). Dome subtracts volume (−). Flat top = 0.
Compression Ratio: —