Question about cams..... single pattern vs split

B3422w5 said
Was talking to a guy at Howards cams yesterday about a possible roller cam for my 418/ trickflow project.
They have a cam i think thats close to what i might want. Its 263/273 on a 108. 640 ish lift.
I asked the guy why the 10 degree split. He basically said its a helpful crutch for an exhaust port.
Not sure the exhaust port would be an issue. They could do something custom more like 264/268, closer to what i was thinking.
Guess my question is, when is a split cam needed and not needed?What circumstances would a single pattern work better?
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Now that I read this again, I agree even more with you. You don't need to "crutch" the exhaust port. On the last cam I bought we didn't even discuss exhaust flow. The port is so bad, you can't fix it with anything other than a different head.

The spilt duration thing is a marketing tool.