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I certainly wouldn't be concerned about minute changes to cam timing unless you are running a 220+bhp engine.
However the risk of a valve clipping the piston top or rather the valve cut out on the piston is real. As there are so many variables involved in this, especially cam lift, best way is to place a thin layer of putty or plastecene (or howerer you spell it) on top of the piston, over the valve cutouts. Smear a thin layer of oil over the valves to avoid sticking to the putty, bolt the head up carefully to the correct torque with a standard gasket (one you had on before will do) and slowly turn the engine over by hand two full revolutions without the plugs in. Take it part and measure the thickness of the putty after it has been squashed. That will tell you the exact clearance. I was told never to go below 5 thou to allow for heat expansion and movement, but interested in what others think.
Geoff
Hello, electronic solder tin does also the job. Put a few lines on the pistons and here you go.
Jeroen