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If you do go that route, DO NOT buy a cheap brand.
The reason we have the heavey underdrive pulley is for crank balance and i think to absorb engine vibration...Going lighter will reduce the effectiveness of this but you will gain...maybe 3 hp per pound lost in weight. Some manufactors claim to have very well balanced underdrive pulleys...If i were to risk it, i would go with those companies product.
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