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  1. Engine Tunes/Mods
    Currently Replacing the Head Gasket on my 4.2 L6 Current Additional Replacements: •Water Pump •Radiator •Timing Assembly •Fuel Injectors •Fuel Pressure Regulator •Spark plugs What else is recommended to replace or modify while I'm in this process? I may be upgrading the intake and adding a...
    head gasket performace valves
  2. OEM Issues
    Last Friday, I was driving home from work when my 04 Trailblazer threw a check engine light and started misfiring, I figured I just needed to replace my spark plugs which I planned on doing over the weekend anyways. It progressively got worse as I was on my way home. Next day after work I was...
    misfire cylinder 1 trailblazer 04 valves
  3. Engine Tunes/Mods
    Valves started chattering. What should I do? Is this common in a 4.2 6 cylinder?
    valves
  4. OEM Issues
    Just wondering. The local Chevrolet dealership has seen 6 TB of years 02 - 04 with burned exhaust valves over the last several months. They claim it is sorry local 87 octane fuel and are recommending the use of 89 for this reason. The area I live in is a small rural city with two fuel...
    87 octane exhaust fuel valves
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