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There is nothing wrong with GM factory self aligning rockers. I would check for coil bind, and bottom of retainer to valve seal clearance (at full valve lift) on any instl. with over .450" lift. What works on one assy. does not mean it will work on "yours". Every engine build up has different tolerance acumulation. Don't cost a thing to check, & better to know that "your" assy. has proper clearance intstead of hoping it does.
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