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McKenzie used a 1/2-inch drill bit to enlarge the pushrod holes in our Vortec heads. Be sure to drill at the same angle as the factory design. This will increase the inboard pushrod clearance when using 1.6:1 rockers.
It's A Spring Thing

 McKenzie used a 1/2-inch drill bit to enlarge the pushrod holes in our Vortec heads. Be sure to drill at the same angle as the factory design. This will increase the inboard pushrod clearance when using 1.6:1 rockers.  View Related Article

 

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