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Crankster · 10-16-2017, 05:03 PM

Today kind of messed with it to see how different methods of measurement work and whether there is any discrepancy in the indicated lash between them. With a given cylinder at TDC compression, both valve lifters should be on the heel of the cam lobe. This is how the clearance is measured with a feeler gauge, basically. This is a valid way to measure.

The 300 series "universal" gapper included a hook, so as to exert upward pressure on the rocker arm and take up the clearance. Then the dial is set to "Zero". The total lash is then displayed accurately. I also tried setting the lash at a slow idle. This didn't work as well as I thought it might. It's tough to read, and adjusting the rocker arms while they are moving is a pain in the ass. Overall it seems like using a remote starter makes the most sense. It would be easier on the starter, battery and solenoid to remove spark plugs.

10-16-2017, 05:03 PM	#14
Crankster Senior Member Join Date: Oct 2017 Posts: 563	Re: P & G Valve Gapper Today kind of messed with it to see how different methods of measurement work and whether there is any discrepancy in the indicated lash between them. With a given cylinder at TDC compression, both valve lifters should be on the heel of the cam lobe. This is how the clearance is measured with a feeler gauge, basically. This is a valid way to measure. The 300 series "universal" gapper included a hook, so as to exert upward pressure on the rocker arm and take up the clearance. Then the dial is set to "Zero". The total lash is then displayed accurately. I also tried setting the lash at a slow idle. This didn't work as well as I thought it might. It's tough to read, and adjusting the rocker arms while they are moving is a pain in the ass. Overall it seems like using a remote starter makes the most sense. It would be easier on the starter, battery and solenoid to remove spark plugs.