407 Tappet clearance (hot)
The 407 tappet clearance should be adjusted when at full operating temperatures
0.010 inch Intake
0.018 inch Exhaust
The adjustment is made at the self locking rocker arm adjusting screw.
This screw should have a min of 3 ft/lbs. tension as it is turned.
If less than this, replace the adjusting screw and if necessary, the rocker arm.
The above quoted verbatum from the factory workshop manual.
Nick 407 6028
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