[DavidNJ]

Vizard used the Comp Xtreme Energy cams, their strongest street cam once-upon-a-time. They have been superceded by the Xtreme Energy XFI which I listed. I used the Tight Lash solid flat tappet cam because Comp didn't bother upgrading their Xtreme Energy solid flat tappet. The Tight Lash is closed to the the Xtreme Street Roller, which is also a tight lash cam (lower case).

Vizard is an acknowledged expert. However, that doesn't make him always right.

To further the point, to the best of my knowledge there are no current pushrod flat tappet engines in production, at least for US sale. And those engines by and large have cams smaller than the short lobes in Vizard's article.

P.S.
You seem to have an interesting engine. What cam do you use?