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Unless you have milled your head and wish to re-align your timing with an adj. cam pulley, adding one to a SOHC is pretty pointless. Advancing the pulley means all your valves will open sooner but also close sooner, which basically does the same thing as just tweaking your timing instead. On a dohc engine the pulleys can be adjusted to open the intake valves earlier and open the exh. valves later for some gains in HP(or other way for more efficiency).
Most anyone I know of that has tried a SOHC adj pulley on the dyno has found -0- to the be the sweet spot, except on engines with a shaved head obviously.
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