†Item shown in picture may not represent exact product . We proudly sell USA Made ProGear timing sets. This high quality double roller chain and sproket set features the following specifications:DETAILSMake: ChevroletEngine: Mark IV - Mark V Big Block V8 w/o OE hyd roller camSeries: Heavy Duty / TR SeriesChain Style: Heavy-Duty double roller chain w/ independent (true roller) seamless rollersChain Length: StandardCam Sprocket: Class 30 grey ironCrank Sprocket: Heat-treated 1141 steelKeyways: 3 on crank sprocketAdjustment: +/- 4 degreesTorrington Bearing: No