Thanks, I don't have a card as I am looking at different cams and trying to get the dynamic into the range of 7.8-8.0 with a static in the 10.0 to 10.5 range.
I think they list the intake lobe duration. Not sure of what you mean by intake lobe centerline. But what do you do with these numbers. ADD, Subtract, Divide?
for example: LOB 112; int duration 213 at.05 or 256 total
Where it can confuse people is the fact there is intake lobe centerline("ICL"), which is for symmetrical shape cam lobes the point of peak lift, .....and there is also lobe separation angle("LSA"), which is the distance in degrees between peak lift or lobe centerline of the intake and exhaust valves.
Since intake lobe centerlines are rarely ever as high as 112į, I would have to assume the spec you have is actually the Lobe Separation Angle (LSA) for that cam grind.
With that being the case, LSA and cam duration alone is not enough info to find intake lobe closing point, we need the intake lobe centerline to have enough info to do the math to find intake closing point.
If you could link the cams info you are looking at, maybe we can see enough info to figure this out.
After reading post #5 and #6 i think Jeff is right about what you are dealing with....too high idle lie,that is typically primary throttle blades open too far and engine is running of the transition slots and not the idle mixture screws. Typically happens when a bigger cam is put in, engine won't idle, so "mechanic" just cranks up the idle speed screw to get more air in so the engine will idle....now it idles but too fast and no response from mixture screws.
Fix is typically back the primary idle speed screw back down, and slightly open the secondary blades to let more air in...second choice is to drill a small bleed hole through each primary throttle blade so you can close the throttle setting down but still get enough air through.