Richard/Tech1,

Well I have indeed learned a lot about high compression related to the SBC and I do not want to annoy you. Within the limit of your patience, I will ask one last question. According to the Speedway catalog, Rhoads lifters reduce duration by 10-15 degrees and lift at the valve by 0.020-0.030". You have hinted that they do work while others have responded on another thread that they just make clicking noise. Therefore my (last and also first) is what cam specifications would be within range of the variability of Rhoads lifters to achieve BOTH fuel economy below 2500 rpm but still allow performancement in the 4500 rpm range. Thinking over what rodders want it is to be "slick" beyond the average family sedan,and yes I do want BOTH mileage and performance. Since I now realize the Melling MTC-1 cam is almost the same as the Edelbrock performer with specifications: (I/E)

278/288 @0.006", 204/214 @0.050" lift and 0.420"/0.443" at the valve

Or should a shorter duration cam be used? I would expect the Rhoads lifters would effect the 0.006" duration more than the 0.050" duration. Assuming I can put up with the clicking noise, does that hurt the longevity of the lifters?

Thanks a lot for your previous helpful comments.

Don Shillady
Retired Scientist/teen rodder