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#1
06-23-2004, 05:10 AM
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I may have lost the bet on idle quality...
If you compare a hyd-roller cam to a flat-tappet hyd cam with similar duration at .050 numbers, the hyd-roller cam will always have a longer seat-duration. While the roller configueration allows faster ramp acceleration, it also suffers from slow acceleration off the seat compared to a flat-tappet cam. Therefore, the advertised-duration numbers are slightly longer. This means that a hyd-roller cam with the same duration at .050 lift as a flat-tappet hyd will not idle exactly the same. (this from a article about fact vs. fiction on hyd-roller cams/ May'02 Chevy High Performance magazine)
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