You'll need to jack it up to do both sides but it will give you more room to slide the header into place on the passenger side with it disconnected and jacked up. And with the emission's headers you'll see what I'm talking about when the AIR and EGR tubes get caught on everything as you try to get it in place. I think it makes it easier if you move the alternator as well.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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