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The Vortec head also uses guided rockers to position the rocker arm over the valve stem. If you choose not to run guided rockers, then you must add guideplates to the heads with screw-in studs.
Iron Vortec Head

 The Vortec head also uses guided rockers to position the rocker arm over the valve stem. If you choose not to run guided rockers, then you must add guideplates to the heads with screw-in studs.  View Related Article

 

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