GM Vortec 300+ HP (Rep. MR43LTS) Includes 8. The Vortec engines have the intake manifold bolts installed going straight down, non Vortec bolts are angled. PLUG GAP .045. BUT, IF USING WITH HVS IGNITION, .060 IS RECOMMENDED.
5.0 MPI and 5.7 Excal 2002 up, Indmar 2006 up 5.7L engines. Superceeds AC 41-993, AC41-932. NOT recommended for Delco distributors, only for use with HVS distributors. PCM and Indmar MPI Plug gap .060".(Price includes 8 plugs). These last 300-500+ hours, clean and inspect anually. Not recommended for carbureted engines.