Yeah, 320-325 is the expected range for your mods. I thought about the LS6 intake as well and actually had a new one to install, but I wanted to keep the EGR to stay legal and pass inspection so I decided to skip it unless I can find one with the EGR hookup in it.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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