No.... Is there a point being made or asked here? If it helps, every rally engine I've run has been 4 cylinders and used stone stock keys in cranks and cams. Running up to 8k RPM regularly on the Opels, and 6.5K RPM on the Mistubishi and Toyota engines. Moderate hi-performance spring pressures (300 lbs open) and .440 to .500+ lifts. Thousands and thousands of full bore racing miles have been run this way, and that puts more total, long term loading that the average street/strip use would ever see. So I don't worry a lot about key strength, BUT I am not running 500-700 lbs open spring pressures either. I would expect rollers to lower the key loading somewhat, if that is a factor.
