Header/manifold dyno test

Be careful with the published cam specs on the magnums. The info wasn’t updated very well and the 5.9 shows the old 360 valve sizes even though the heads are the same as the 5.2. Pretty sure the valve lift even used the 1.5 ratio to calculate it. So, I wouldn’t trust the cam specs.

I had a 2000 5.9 cam reground by Bullet and asked if they would run it through their cam doctor to get the OEM specs. Let me see if I can find a post with them.