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That's a good spring but I'm not a fan of dual. They add weight to the valve and lack the control of a beehive. Problem is that at .650 there aren't many beehives that accommodates that. Lazer and i have changed out stock springs/retainers for psi 1511 and ti retainers and that loses 1lb in the valve train. But thise springs are only good to .625 lift. A double spring/steel retainer would add weight to the valvetrain even vs stock
Did you use atleast use ti retainers?
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