There is a big advantage to buying the right cam instead of the traditional and inexpensive shelf grinds which are mass produced. THey are not really even good designs. Many are sucked in by the so-called cam designers (which they are not) claiming they use a computer to designtheir profiles. Though that is true with some of them, understand that a cam is simply a series of mathametical curves. The computer is not any better at designing cams than a live person who knows how. They can simply complete the task 10 million times faster. After all, a computer program is only as good as the programmer. Garbage in, Garbage out. They will only compute what the program and program designer tells them to. Therefore, they can't design a cam any better, so don't buy into the marketing hype some companies claim in order to sell you a mass produced piece featuring a grossly inflated duration specification.
Just like the aftermarket Hydraulic rollers out there. One in particular produces some reasonably intense lobes. The down side is that they are BRUTAL on the valve train! Which is why the valve train is noisy, too! We design them even more intense than they can. The difference is we know how to design them and we know how without making them brutal.
I love to pick on one giant in particular because they advertise many of their seat durations (advertised durations) on Hydraulic cams at .006. However, if you check one of their finished cams, you usually have to check it at .008 for their number that they are advertising to be accurate. This means that the cam is a bigger advertised duration than what they are publishing. It also means that is is not any bigger at .050 or .200, just at the seat. If you understand cams, you will understand that I am telling you that the cam is bigger when you measure it at .006 then at .008 which means that it is lazier than you originally thought you bought.
Here is an example: If I have a published advertised duration of 288 @.006 (Six Thousandths of an Inch), and a duration @.050 of 234, but when I actually profile check the lobe with a computer analysis program called a Cam Doctor and I get 288 @.008 as opposed to 288@.006, and my duration @.050 is still 234, the cam is showing it to be less intense of a ram acceleration. Why? Because the 288 is at .008 not .006.
If you check it at .006, it is more like 295. Imagine now that the 295 cam (which is 9 degrees bigger advertised than the 288 that they published), but it didn't grow any bigger in duration anywhere else. Otherwise the 234@.050 would be 243 if everything was on the right side. It is lazier then they show it. Why would anyone install a cam to add advertised duration only? Why would any educated person buy a bigger cam if all they were getting was something that was bigger at the seat but not any bigger anywhere else? They would not do it knowingly, which is what I am trying to illistrate here.
They are doing this with the numbers because they know it is a lazy design. The smaller the seat duration is and at the same time the bigger the duration @.050 and 200 is, the more intense the ramp is. Therefore the more power including low end the engine will make at all RPM's.
I hope you can see what I just did. Are you pissed yet? Now you understand one of several reasons why these cams never deliver what they are marketed as being able to deliver. You can also see why they kill more low end power than you thought they would. You have just been sold a cam by a cam company who knows very little about actual cam design, but knows a whole bunch about creative marketing.
Buying this crap without understanding, is going to set you back financially and usually competitively as well. And as I said before, making a choice about which cam to buy based on a lift and Duration @050 comparisson against other cams, is basing your decision on only 20% of the facts. THe problem is that most cam companies do not publish the .200 numbers. Can you guess why? Many also don't post at what point they measure the seat or advertised of their Hydraulics. By now you should be able to guess the answer.
Call some of them, I bet most of the techs on the phone won't have a clue what you mean when you ask what the duration at .200 is.
If you buy based on price, then you deserve whatever does or doesn't happen. I am not saying a cam has to be expensive to work. I am saying that when you buy a $39.00 to $99.00 camshaft that was designed 25-35 years ago, you shouldn't be too upset or surprised when it doesn't cut the mustard. You might even be inexperienced enough with racing and engines to feel that it does. You must have never had soemthing to really test it against. Forgive me for being blunt here, because I will simply say that you get what you pay for. Try one of my designs and I will give a money back guarantee that you will never buy from "Them" again!