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What is the difference between high ratio roller rockers or ultra high ratio roller rockers (1.9:1 or 1.98:1) to suit Ecotec & L67?"
Posted by on 18 April 2018 07:54 AM
The ultra high ratio rockers give more valve lift allowing the engine to breathe better.  With the ultra high rockers you tend to see more high rpm gains than with our 1.9 high ratio rockers.

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