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If the heads came off a z06 they should have sodium filled valves. If you opt for anything but TEA's stage 1 port program, you will have to buy their bigger valves. I cant tell you whether the valves need replaced by looking at them...best way to check would be a leakdown test.
PM'd you on price.
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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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