I sacrifice a lash adjuster and shim it solid with close to zero clearance.

If you are measuring at the valve yes the lash adjuster matters since the cam will have to rotate further to make contact.

You can figure out how much milling the heads affected your cam timing by taking the diameter of the crank sprocket and the distance you moved the head closer to the crank ( asuming the tensioner is on the slack side).

( 360/3.14 * the crank sprocket Diameter) * amount milled= retard added

So for a head and deck milling of .008" and a 2" diam crank sprocket the cam would be retarded

(360?/3.14*2)*.008= .46? Of crank rotation.

Also in my experiance the belt should not stretch or change enough to make a differance.

web page

A general rule of thumb is that 2? or less timing change is very hard to find on the dyno.

The cam should be ground assymetricly to account for the varying rocker arm ratio since the effective arm lenght changes as the rocker amr rotates on the shaft.

I would look at the cam both ways.. opening point VS TDC and finding the lobe center line by taking to similar lift points on each flank of the cam.

For fun you can always plot out the entire lobe profile. <img src="/forums/images/graemlins/cyclops.gif" alt="" />

It takes a while manually... Some day I will have a quick way with a couple of optical encoders and a data aquisition box.

Also since the roller does not take up the entire cam face you should be able to see / measure how much the cam has worn.


Kevin C