The old 451 has an Ultradyne street roller 251/251@ 0.050" and I had around 10,000 street miles on it and maybe around 1,000 1/4 mile passes.
The new 500 engine is using the comp HXL lobes 264/264 @ 0.050" with 112 LSA, and so far it has been OK. My friend says my car is too quiet and smooth running. So far I only have about 100 street miles on it, and maybe 50 1/4 mile passes.