GX120 Cylinder Head Gasket Engine Parts and Accessories replacement This cylinder head gasket is designed for use with GX120 engines.It serves as a seal between the engine block and cylinder head to maintain compression and proper functioning of the internal combustion process.The gasket is constructed to withstand temperatures and pressure common in small engine applications.It is intended for replacement during engine maintenance or repair.Compatible with standard GX120 engine configurations, this part supports performance in various types.