Cam degreeing. I totally don't understand.

New mild build 340. I think I understand the degreeing process. but from these cam specs what am I looking for at centerline. Doing what I've read, heard, watched. Off the #1 intake lifter I end up with 110. From these specs what number am I looking for?

264-264, 214-214 @50 lift int./ex 440 lobe separation 110. Centerlines int. 106, ex 114


If your intake center line is 110 for the intake, then the exhaust center line will be:

2*lobe sep - intake centerline = exhaust centerline
2*110 - 110 = 220 - 110 = 110 BTDC = exhaust centerline

For advertised duration:

intake centerline - intake duration/2 = intake open
110 - (264/2) = 110 - 132 = -22 = intake open
This means that your intake valve will open at 22 BTDC

Intake centerline + intake duration/2 = intake close
110 + (264/2) = 110 + 132 = 242 ATDC
now to get the relationship back to TDC, just subtract from 360
360 - 242 = 118° BTDC = intake close

exhaust centerline - duration/2 = exhaust close
110 - (264/2) = 110 - 132 = 22 ATDC = exhaust close

exhaust close - exhaust duration = exhaust open
22 - 264 = 242° from exhaust close
Now to get the relationship back to TDC, subtract it from 360
360 - 242 = 118° ATDC = exhaust open


for duration @.050"

intake centerline - intake duration/2 = intake open
110 - (214/2) = 110 - 107 = 3° = intake open
This means that your intake valve will open at 3° ATDC

Intake centerline + intake duration/2 = intake close
110 + (214/2) = 110 + 107 = 217 ATDC
now to get the relationship back to TDC, just subtract from 360
360 - 217 = 143° BTDC = intake close

exhaust centerline - duration/2 = exhaust close
110 - (214/2) = 110 - 107 = 3° BTDC = exhaust close

exhaust close + exhaust duration = exhaust open
214 - 3 = 211° from exhaust close
Now to get the relationship back to TDC, subtract it from 360
360 - 217 = 143° ATDC = exhaust open


* Info based on intake centerline of 110°