Need for more speed

Some Model T cam shafts are pretty crude. To get them to run correctly the valve lash was adjusted for the same valve timing on all cylinders. So the lash could be 0.010 on one valve and 0.020 on another. The lash of the exhaust valves were adjusted so that all the exhaust valves opened at the same piston positions and the intake valves were all adjusted so that they closed at the same piston positions.
 
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