Stroker specific cams?

DrEamer said
I have been discussing this whole cam selection with another member here via PM's. We went over the combination in fairly good detail, and he came up with something similar to the Jones cam, without the IR lobes. I might be able to get more power out of the IR's, but I also will be able to use non proprietary lifters without fear of valve train wear issues. The one thing that once again came up is the use of a single pattern cam. I found an article from Engine Builder Magazine mentioning that single patterns are becoming more prevalent as the newer generation of heads have better exhaust flow then those of the past. Thereby, decreasing the need for split duration cams. I know that this may have been covered in this thread somewhere, but good to see it elsewhere. It is a basic article to a lot of folks here, but good information for those of us not as well versed in these things. Link provided below.

Choosing the Correct Camshaft - Bangin' on the Bumpstick - Engine Builder Magazine

I'll post this here and then get ready to take my lumps.

Exhaust flow is really a non factor in cam selection. Seriously. Flowing an exhaust port and believing the numbers is a sure fire way to make the port way too big. BTDT. A flow bench will tell you to make the port bigger and bigger. The port may be dirty, noisy and screaming loud (none of which you see on the sheet you get with numbers on it) but man, I'm flowing 85% of the intake so I'm smoking this deal.

And then on the dyno you are opening the exhaust lash and the power is going up. Then you advance the cam and the power curve goes UP!!! And you think WTF? The port is just too big. Probably the valve too.

So picking a single pattern cam based on exhaust flow doesn't make sense.

I've posted this before. What you see with dual pattern cams is not more exhaust duration. It's LESS intake duration. Then, to make the engine RPM where the customer wants' the cam grinder moves the timing and opens the LSA up so it will have more HP after peak. I've been battling with this for a long time. It's hard to get the cam guys to admit what they do. Thanks Comp.

So I'm all for single pattern cams. And don't forget, you can have an intake lobe that's 250 at .050 with .350 lobe lift and an exhaust lobe with the same numbers and two very different lobes.