Cylinder Head Gasket Set Engine Multilayered Steel Fits: 1992-1995 Honda Civic VX Si EX 1.5L 1.6L I4 Engine Code D15Z1 D16Z6 Multi-layered steel (MLS) head gasket - Camshaft front - Viton valve stem seals - Intake manifold gasket - O-rings Exhaust manifold gasket - Silicone sealant - Valve cover gasket The cylinder head bolts hold the cylinder head in place and ensure that the cylinder head will continue to hold up despite the tremendous amounts of pressure in the combustion chamber. They should always be in perfect condition and should be maintained properly. So, if you notice that this part is showing signs of excessive wear, have them replaced immediately. Be sure to have your cylinder head bolts replace with aftermarket replacement cylinder head bolts as soon as it starts to give you trouble.