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The stock yellow springs are rated at 0.550" max lift....so unless you want bad things to happen, its worth upgrading. I think PAC singles are compatible with the stock seats and retainers if you want to re-use them.
Yes, sounds like you got a great deal on those heads.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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