CylHeadDowelPin, Cylinder Head Dowel Pins, Cylinder Head Dowel Pins; 0.638/0.639 OD x 0.5 in.; 2 pc.;, These hard to find dowel pins are precision machined then case hardened for accurate alignment in engine assembly. 2 per set., Precision Machined, Case Hardened, Give Accurate Alignment, 2 Per Set, Engine Cylinder Head Dowel Pin