Comp Cams VS Camshaft Question

[cboney2003]

ZZP's site says that the stock heads flow worse over 0.500" lift as I also thought, but their VS cam for stock heads has the specs:

206/216 at .050"

Intake Lift .320" (.512" lift at 1.6:1 rocker ratio)

Exhaust Lift .317" (.507" lift at 1.6:1 rocker ratio)

115 Lobe Separation

Why would they go over 0.500" lift if this is for stock heads? Also, is this a good cam for a 3.8 with an intake/3" exhaust/highflow cat/pacesetter headers/stock shift points or would a custom one be better?

[Nachius]

I believe they mean it will work fine with stock heads, not that that is the most beneficial for using this cam.

And this cam is more of a nitrous/supercharger cam
better off getting a custom grind if you are N/A

The wide LSA more or less makes it a power adder cam along with the split duration to a point.

If you want a N/A cam people have had good luck with same duration cams ie 218/218 with around the same lift specs as that one, and 112 LSA.
The IC determines advance/retard and there are arguements both ways that a retarded cam will produce more power, however I don't know anyone that has ran a cam with a higher IC than LSA so I don't know that its been proven.

[malice10985]

WIth a really high lift cam, the velocity of the air coming through the head intake ports will be lower. I think our heads benefit from high intake air velocity in stock form. That is why they flow worse over .500"

I am just speculating this, I don't know that it is 110% right.