High
zinc, solid lifter cam friendly oils can be delivered to your door. High quality solid lifters are easily available. Quality cams are everywhere. The "danger window" of cam failures is in the past. If you want a high revving, street friendly, track friendly, low idle tolerant, long lasting, low maintenance and exceptionally cool sounding engine, solid flat tappets are the way to go. We're back where we were before the "they're trying to kill our engines" scare of a few years ago. Don't be afraid to put them in your Cobra.
