RACING: FINE TUNNING OF CAMSHAFT.
In addition to changing the Camshaft timing (advance /retard) there is also a way to fine tune the Camshaft to maximize an engine's potential.
This method of camshaft tuning can be accomplished by altering the valve clearance adjustment. GS /EFE valve clearance setting can be altered by + or - 0.002".
Changing the valve adjustment clearance within this range will help to fine tune an engine's performance. More clearance (+) will increase the low and midrange power and less clearance (-) will increase top end power.