How do you figure a cams centerline?

my cam card gives info on lift, duration both at .050 and running, and valve opening and closing points. What is the formula for taking this info and figuring the centerline?

post the opening and closing points.
Intake installed centerline + Exhaust installed centerline / 2 = Cam LSA (centerline).

So if the intake is to installed 106 ATDC
and exhaust is to be installed 114 BTDC
106 + 114 = 220 / 2 = 110 Lobe separation angle
(cam centerline)

If you take the intake openning point (keeping in mind 360 degrees rotational angle) and closing point and figure the point inbetween you can find the intake installed centerline. Same with the exhaust. If you have the numbers you can use those to figure it out, just keep in mind TDC = 0. BDC = 180, and do the math accordingly Hope that helps!

If intake opens before bottom Dead Center
(IO + IC + 180)/2 - IO = ICL

ex is basically the same computation but subtract the EC event number

Here's a computation for a 284/528 solid MP cam.
IO 32 EO 76
IC 72 EC 28
--------------------
Intake
32 + 72 + 180 = 284
284/2 = 142
142 - 32 = 110
---------------------
Ex
76 + 28 + 180 = 284
284/2 = 142
142 - 28 = 114
---------------------
LSA = (ICL + ECL)/2

110 + 114 = 224/2 = 112

Quote:

---

my cam card gives info on lift, duration both at .050 and running, and valve opening and closing points. What is the formula for taking this info and figuring the centerline?

---

Are you asking for the lobe seperation angle or the installed intake centreline? , these #s will usually differ around 4*.