Request camshaft/valve lifter rule change
#27187 from John Barnett · Not recommended · Minutes (2019-10 Fastrack)
Thank you for your letter. The committee does not recommend a cam /lifter change at this time. The
committee recognizes the changes in oil additives has reduced the zinc content in many oil products but
feel the introduction of a roller tappet lifter would be too advantageous due to increased ramp rates
and duration increases with the same maximum lift restriction. The committee is considering
alternatives to increase the reliability while reducing the cost of the powertrains in the cars. We
encourage you to continue to support the American Sedan class and appreciate your input.