Kents or a piper cam will produce better power, but only while they are new and un worn.


The problem is the material of the lifter is crap, (as they buy cheap items) so the cam has to be the same material, to stop one killing the other fast.

But what you get is a cam and follower that are not very robust, and mixed with the CVH, they dont last long at all if its not run in correctly, and used with clean good semi oil, and as long as oil pressure/supplie to the head is good.

The reason they wear alot faster than std cam's, is due to the more stress produced by the higher lift and stronger valve springs.

The only after market cam worth buying at the Moment is a Newman's, as they have the CVH market cornered at the moment, with there solid lifter profiles, (Their hydrolic has the same issue's as Kent and piper), This is because their solid lifters are made to thier spec, in a Chilled Cast material, which allows the cam to made in the same material which is alot more robust material, which last's fine in a CVH.



Also dont forget, alot of people go to a new Kent or Piper cams from a 100 k mile old cam, so are comparing a worn std cam against a fresh after market cam.
If you do the same test, with a worn std cam, against a new pattern part cam, you will see good results too.




As for using a N/A cam, it wont be worth it, as that wont work at all well with a Turbo car.