Tell you buddies they're morons. The only change to the "rotating mass" is the mass of the pulley itself, and if that messes up your engine, take the engine back to the honda dealer and get a 302 from the Ford dealer.
Pulley's will reduce the radial force (torque) required from the crankshaft. The force is then added to the crank on the backside (flywheel side). It has nothing to do with "rotating mass".
Tell these guys to stop smoking crack.
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White 1995 Mustang GT
Dynomax Cat-Back, Offroad H-pipe, K&N Filters w/o Air Silencer
My 1995 Mustang GT