You should calculate DCR based on the cam to determine how close to the limits of pump gas you are. Both those heads have good combustion chambers so you can push it a little further.
Post the cam card, head gasket thickness, and piston to deck height at TDC if you know it.
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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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