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The stock springs will only accommodate around 0.420 inch of valve lift. Other limitations of the Vortec heads include the press-in rocker studs and the required use of center-bolt valve covers (arrow).
Iron Vortec Head

 The stock springs will only accommodate around 0.420 inch of valve lift. Other limitations of the Vortec heads include the press-in rocker studs and the required use of center-bolt valve covers (arrow).  View Related Article

 

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