^^This is also true. A lot of companies make "dyno proven combos". I'm not sure I like the idea...most of them don't add the kind of power you'd really want from the parts they offer. Take Holley for example and their SysteMax kits. Heads, intake, and a cam with all the associated hook-up bits and pieces. Now on a Ford 5.0L they advertise 350hp. Now Holley's intake are great, so I could buy one of those, some Canfield of AFR or even Brodix heads, and a strong cam and probably come out closer to 400hp or more. Those packages are generally designed for people who don't want to put a ton of thought into their combos. Not that there's anything wrong with them...they make decent power and work well in a specific powerband, but you can get better results choosing stuff yourself if you have a good idea of what you're doing. I wouldn't go anywhere without a custom ground cam. 
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