Billet Alum Connecting Rod (3.308 std length)Fits Both Hem 60363 and Non Hem 69730 ForPredator 212ccAdding this rod to either ForPredator 212cc Engines will keep piston in its present location in the cylinder.For Predator 212cc Engines average .020 to .025 below block deck from the factory..** 6254 Std. Rod Keeps piston at same location** 6256 +020 Rod Raises piston .020 higher in cylinder (Brings factory piston to top of cylinder (Adds Compression)** 6252 +040 Rod Raises piston .040 higher in the cylinder (This rod is used mostly on a non hem 69730 when you install a flat top piston.. The flat top pistons are .020 shorter on compression height so this rod brings piston to top of cylinder.