*Standard valve spring cannot be used. *TODA Up Rated Valve Spring required *TODA Cam Sprockets required. *On installing confirming that there is enough, valve to piston clearance, valve to valve clearance, cam lobe to follower clearance on VTC operation. *Programmable ECU with tunable VTC required. Customers discretion required on selecting an ECU. *Caution the exhaust finger follower (roller rocker-arm) may need modifying, due to contact with the cam lob.
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