im not talking about changing the DOHC but modifying it with a roller cam grind, roller rockers, and roller lifters, i dont think it would provide a substantial amount of hp or tq, mostly just to say i have the only roller zetec 2.3, or roller zetec for that matter. there would be no moving of the cams, just modification of the cams lifters, and rockers, the end result is the valve reaching peak lift quicker and therefore closing quicker, because of the roller grind, allowing the valves to be open wider longer equaling more efficiency.
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