Im running BBK underdrive pullies and the crank pulley is pure aluminum. Now this is my daily driver so what do you guys think about that. I have heard that running a underdrive crank pulley can be harder on bearings on other internal components.
Well - what you heard is true.
Either put your stock crank pulley piggyback style on your new one or settle over to underdrive pulleys with integrated dampener (like Steeda).
