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  1. Do you have to remove exhaust manifold to remove cylinder head?

    OEM Issues
    Hi All, New to this site...lots of great info here. I did some searching, but can't find an answer to my question. I bought an '06 GMC Envoy XL and only drove it 100 miles before the check engine light came on with a misfire on cylinder 6. Diagnosed it as a bad lifter (AFM) and observed the...
  2. DoD Delete question

    Engine Tunes/Mods
    okay to start I have a 06 Trailblazer with the 5.3. I had a DOD lifter fail on me so I did the DOD delete. New PCMofNC Rob style cam LS7 lifters LS7 valley pan replacement new valve springs PCV delete PCMofNC mail order tune everything else is stock. I'm getting some valve train noise after...
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