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 03-05 Dodge Neon SRT-4 03-09 Chrysler PT Cruiser Turbo Fits 2.4L Turbo