Head Gasket Set Graphite For: 1988-1995 Honda Civic 1.5L 1.6L I4 Engine Codes D15B2 D15B7 D16A6 Graphite head gasket - Camshaft front - Intake manifold gasket -O-rings - Viton valve stem seals 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.