carlo check on the website of whoevers cams you have...

they will give you the dial in figures, it is critical its right, it also can effect afr in a big way, so make sure its checked carefully afterwards, its ideal to do this before mapping.

the website should give you a max lift figure of xxx degrees, use a crank disc to measure and turn crank from true tdc to this xxx figure,

thats where your cam should be at max lift, adjust to suit using a dti to measure the full lift.

this is the basic procedure to do them..



Install a dial indicator for checking the height of the intake valve lift.

Rotate the crankshaft to TDC (top dead center) and install a degree wheel on the crankshaft. Then install the degree wheel pointer aimed at the zero position of the degree wheel and also align the zero position of the dial indicator to the indicator’s needle as a reference point.

Rotate the crankshaft clockwise until the dial indicator reads maximum lift and reset the indicator to zero.

Rotate the crankshaft counterclockwise until the dial indicator reads 0.100”

Rotate the crankshaft clockwise until the indicator reads 0.050”.

Record the degree wheel reading.

Rotate the crankshaft further clockwise until the indicator rises to maximum lift and back to 0.050”.

Record the degree wheel reading.

Add the two readings from the degree wheel and divide by 2 to find the intake centerline for your setup.
Example: 156 + 46 = 202, 202/2 = 101

Compare your intake centerline to the intake centerline listed on your camshaft's spec sheet. (The numbers should be the same although ½ degree either side is an acceptable)





in my experience the yb crank mark is spot on, but its worth checking tdc is on the money.

once done turn engine over by hand, feel for any contact, then re check max lift.


try quaife for verniers the do 909 style ones which are nice...like mine.