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Review on πŸ”§ Dorman 674-940 Exhaust Manifold: A Perfect Fit for Your Chevrolet / GMC Models by Edward Noble

Revainrating 5 out of 5

Save time and buy a new Upstrem Sensor 02.

Manifold, Manifold Gasket and Gasket/Converter O-ring, they all fit together. It's a good idea to buy a PCV valve and air filter as these are easy to replace once you've removed all the parts needed to access the manifold. Buy a top O2 sensor to save time, the sensor couldn't be removed and broke. Some are made in China but appear to be of decent quality.

Pros
  • Automotive
Cons
  • I vaguely remember