I recently received a set of overhauled Griffon Fingers-
Harbor Freight tool modified to remove cam rails where they press into the #1 Cam Tower-
Warning to Vlado- Get the bottle out, this might bring up bad memories!
Since none of these fingers had been installed in this Cam Rack and also on these heads they have to get fitted.
There are 2 Intake and 2 Exhaust valves per cylinder. There are 2 rails, inner (exhaust valve pivot) and outer (intake valve pivot), The fingers pivot on the rails. There are spacers and shims in different configurations depending on whether its the inner or outer rail. The shims come in all thicknesses, from '030" to .100" and are used to center the valve adjuster on the valve stem and to adjust clearances for oil pressure control.
To start I cut a couple junk rails to use to mimic the whole rails so I wouldn't have to constantly remove the entire cam rack to make adjustments and changes
The outer or Intake Valve Rail Spacer and Shim-
View looking outboard of the Intake Valves and fingers, the inner rail is in the foreground. This shows alignment of valve stem and adjuster on the finger-
Clearance of all the parts on one rail for one cylinder should be about .008" as measured with a feeler gauge set. Book calls out .008 to .012 as installed range and max in service of .020.
Sequence typical of one cylinder, in this case the exhaust fingers. 1st install a shim, I started with what was used on the last set as a starting point-
Then the rear finger-
Center spacer is used on the inner rail. The outer rail has 2 spacers with the fingers touching in the center-
After the fwd finger and spacer is installed you check the alignment-
As you go through you find yourself looking for a spacer .001 or .002" different to get the clearance tight. Other times you might need to move the adjusters .010-.015" to get the finger centered on the valve stem.
When you get a cylinder done it looks something like this-
All marked up so it can be removed to the bench and you can start on the next cylinder. You only have 24 sets of adjustments to make, 2 per cylinder.