If the psi of a amc 360 engine is 155. What is the compression ratio?

To determine the compression ratio from the psi (pounds per square inch) reading of an engine, you typically need additional information, such as the specifications of the engine, including the displacement and the type of gauge used for the psi measurement. However, a common method is to use the formula: Compression Ratio (CR) = (Absolute Pressure in Cylinder + Atmospheric Pressure) / Atmospheric Pressure. For example, if the atmospheric pressure is approximately 14.7 psi, the absolute pressure would be 155 psi + 14.7 psi = 169.7 psi, leading to a rough compression ratio of about 12.5:1.