http://www.raylarengineering.com/inta...

Larry talks about the prototype intake manifolds and resulting custom intake manifold options available from Raylar for the 8.1L / 496. We also answer all of the questions about different bolt lengths from GM as well as which gaskets you should use. If your 8.1L is burning oil, we explain the correct gaskets to replace your old worn out gaskets with to eliminate the problem. Finally, a step by step showing you how to install any 8.1L intake manifold.

70mm Black Intake Bolt, Qty 1 GM Part #: 11609264