Stretched Head bolts can lead to blown head gaskets and overheated engines. Head Studs offer a alternative when its time to reseal a engine head. Bolts when torqued are affected by two difference forces. The bolt stretches and twists. A Headstud will not twist as only the nut is torqued down. This allows them to add more clamping force and helps reduce the chance of burning up a gasket Fit 01-05 Acura EL 88-05 Honda Civic 93-95 Honda Civic DEL SOL 8-91 Honda CRX Fits D Series Engines