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These squish piston engines are otherwise referred to as flat head engines. Modified block squish piston engines utilise a space in the block to create a pocket for squishing and combustion to occur.

Modified head squish piston engines can also be made to fit the application on a flathead engine as well as overhead camshaft and two stroke engines. Depending on the shape of the pocket and what type of engine, the valve position must be skewed to ensure that both the intake and exhaust valve can fit in the pocket. Modified head squish piston engines utilise a space in the head to make an air pocket for squishing and combustion to occur.

These combinations are used when certain design parameters that attribute the shape and constraints of the combustion chamber. Some engine designs include combinations of these different design types. Squish piston engines are achieved by modifying an engine's head, block, or the piston crown. This efficiency and swirling can also reduce the amount of soot production. Heat transfer is aided when the combustion gasses swirl around and heat the cylinder wall and the cooling system more efficiently. Turbulence in the combustion chamber due to this squish helps with air-fuel mixing, cylinder wall heat transfer, thermal efficiency, and overall engine performance. Squish piston engines are also found in both two stroke and four stroke engines. Squish effect may be found in any fuel type internal combustion piston engine. Squish effect may be found in side-valve, OHV and OHC engines, including engines with a Heron cylinder head. The gases are suddenly "squished" out within the combustion chamber, creating turbulence which promotes thorough air-fuel mixing, a factor beneficial to efficient combustion. In an engine designed to use the squish effect, at top dead centre the piston crown comes very close (typically less than 1 mm ) to the cylinder head. Squish is an effect in internal combustion engines which creates sudden turbulence of the air-fuel mixture as the piston approaches top dead centre (TDC).