[Alan Roehrich]

To be abundantly clear, what NASCAR is using is so far removed from what is on an NHRA flat tappet Stock Eliminator engine as to complete preclude any direct comparison.


And I remember vividly more than one instance where entire teams had failures directly attributed to DLC, and even engine suppliers who supplied several top teams. JGR at one point pulled every engine in every single car they had, and every team they supplied. The DLC came off, and they were arguing with the DLC coater, the lifter supplier, and looking at their oil that they were having blended themselves.


It's not common now, but again, these are engines with larger diameter lifters, with shaft mounted high ratio rockers, closed cam tunnels, with 60MM and larger cam cores, trick oiling, dry sumps, and entirely different cam profiles and valve train systems.