Valve Adjustment Calculator 

Hate doing the math for valve adjustments? The Shim-O-Meter ™ is just for you. Start by choosing your powerplant from the drop-down list below. For each valve, enter the measured clearance and existing shim thickness in the spaces provided. When Shim-O-Meter™ has the necessary data, it will calculate the necessary shim sizes to bring those clearances into spec. And, when it's time to order those shiny new valve shims, please don't forget our AlfaCentro Advertisers!

Note: Shim-O-Meter requires a browser that supports JavaScript 1.2

Shim-O-Meter Valve Adjustment Calculator
Select your motor from the drop down list (choose "Custom" if your model is not shown or if you are not using stock clearances):
display: inches
mm
model (optional info for your records):
round: thousandths
ten-thousandths
Exhaust

spec clearance

Alfa 4 Cylinder Head

Keep an eye on what your valves are doing over the long run. Use the button below to create a print-friendly version of this info for your records.

  • Alfa Romeo valve shims come in sizes from 1.3mm to 3.5mm in .025mm increments.
  • In a pinch, it is possible to grind a shim down by rubbing with #600 sandpaper mounted on a piece of glass.
Intake

spec clearance

exhaust 1
clearance
shim
need shim
exhaust 2
clearance
shim
need shim
exhaust 3
clearance
shim
need shim
exhaust 4
clearance
shim
need shim
intake 1
clearance
shim
need shim
intake 2
clearance
shim
need shim
intake 3
clearance
shim
need shim
intake 4
clearance
shim
need shim


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