The Whiplash and Thumpr cam are not junk. They are simply geared more toward people who want sound. But you have to still be careful with them in a street car with say 3.55 and numerically lower gears. They do have gobs of duration @ .050 for their size and are ground on tight LSAs. Those two things put together add up to needing a pretty loose converter and some fairly stout gears, REGARDLESS of what the marketing says. I don't care what the marketing says, you simply cannot get around that and you cannot tell people who are hell bent on using them a damn thing. There's nothing new about the way they are ground. Crower was doing it 40 years ago with their Hydraulic Hauler series. No, they might not have as aggressive lobes, blah blah blah, but the idea was still there. Much longer exhaust duration with a tight LSA. Same idea. But you STILL need the gears and converter to match, or it's going to run like a turd. There's nothing special about how those cams are ground that will make them work with stock converters and stock gears. Not a damn thing. That's why I always recommend building an engine based on how you want it to RUN, not how you want it to sound. Because if you build a true high performance engine, the sound WILL be there. I wish people wouldn't be so easy to fall for all the bullshit.
Once again, I am not saying Whiplash and Thumpr cams don't work, they do. But unless you use the other items you've locked yourself into by choosing those cams, they will never run to their full potential.
