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Originally Posted by WildBillyT
You snapped the pushrod or bent it?
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snapped.
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Retainer to guide clearance is the primary Achille's Heel of the Vortec. For valve lifts above .460" they need to be checked for R-G clearance. This varies from head to head. Some find they can get .480" and slightly more valve lift fine. Others will find .460" about the limit. Always check R-G with any performance cam above .460".
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That's what I found about them. I have no clue about what it means, what mine is. my lift is .510