[mstngjoe]

Vizard's article was about "street" cams and illustrated some "general, ballpark" findings about what is "so often assumed". I should have noted that in my earlier postings.

In the context of Pearlsnakes original comment about "non performance; this is a daily driver car" I thought the testing by Vizard to be valid and relevant to his situation. Especially if you factor in the cost of converting to the roller vs the "performance" gained over the flat tappet. Not everyone of course considers cost a factor, but I do and must.

Vizard's experience, knowledge and resources are far and above the average hobbyist and most "performance experts" as well. If you find his methods and conclusions invalid, so be it.

It's a given that comparing flat tappet cams to roller cams is difficult at best. In order to optimize each design, specs would obviously need be moderately if not considerably different.

I'm always on the lookout for articles and testing that prove or disprove general assumptions about performance gains for a given part in a street application.