I guess it depends upon what you call "straight up". To me, straight up is always installing the intake centerline at the lobe separation angle. If a cam is ground with a 110 LSA then installing it with a 110 ICL would be straight up. Even if the cam manufacture grinds it with 4 degrees advance, straight up would be 110 ICL. Installing a 110 LSA cam with 4 degrees advance ground in it, at 106 ICL, would not be straight up, but 4 degrees advanced. That may not be the only way to understand it, but that's how I keep it straight in my mind. I guess that's because I don't give a damn where the cam is ground, I'm gonna install it where I WANT IT.
All they do in effect by grinding a cam 4 degrees advance is place the locating pin or keyway in a different spot. Sometimes when they grind them 4 degrees advance and you install them dot-to-dot you will find the ICL to be 102 to 112. It's why you hafta degree your cam in every time.
All they do in effect by grinding a cam 4 degrees advance is place the locating pin or keyway in a different spot. Sometimes when they grind them 4 degrees advance and you install them dot-to-dot you will find the ICL to be 102 to 112. It's why you hafta degree your cam in every time.