[Steve C.]

The idea of testing a hyd flat tappet and a hyd roller with the same intake duration at .050-inch would be costly and one would have to ask why. If your going to upgrade to a roller most would add additional duration with a roller cam anyway, silly not to.

Example, toss the "041" or Comp XE274H flat tappet and move up to a hyd roller like a XE288HR or maybe the XE293HR.

I found this interesting...

"Cam companies are working hard to produce more and more streetable solid roller cam combinations because the tappet manufactures are slowly reducing production of flat tappets to the point of possible extention in another decade. By then, it'll be almost impossible to find a flat tappet cam. In fact, the only real reason flat tappet cams have lasted as long as they have is because of cost. They're much cheaper to run than any roller cam. But, just as the costs of our rides has increased by a factor of at least 10 in the last 30 years, so will the cost of building engines. Luckily, the aftermarket knows the value of affordable parts and is constantly looking at new sources for roller cam blanks and roller tappets that will be cheaper and more reliable on the street."
From the article "Rolling for Power"
June '04 PHR magazine