Here's a breakdown:
Why it's not ideal:
* Emissions: EGR is primarily an emissions control device. Without it, your engine will produce more NOx (nitrogen oxides), a major component of smog. This could lead to failing emissions tests in areas with stringent regulations.
* Slightly higher combustion temperatures: EGR cools combustion by introducing cooler exhaust gases. Without it, combustion temperatures might be slightly higher, potentially leading to increased engine wear over time (though this is usually minimal).
* Detonation (pinging): Higher combustion temperatures can increase the risk of detonation, especially under load or with lower-octane fuel.
Why it might be okay:
* Many older vehicles didn't have EGR: Older 350s were never equipped with EGR, and they ran fine.
* Performance applications: In some performance applications, removing EGR is done to slightly increase power output. However, this comes at the cost of increased emissions.
The bottom line:
If you live in an area with strict emissions testing, running a 350 without EGR will likely result in a failed test. If emissions testing isn't a concern, and you aren't pushing the engine extremely hard, the impact will likely be minimal. However, using higher-octane fuel is advisable to mitigate the increased risk of detonation.
Before removing the EGR system, consider the following:
* Your local emission regulations: Check your local laws regarding emissions.
* Your intended use: Will the engine be used for mild street driving or high-performance applications?
If you're unsure, it's best to consult a mechanic familiar with small-block Chevys and emission regulations in your area. They can advise you on the best course of action based on your specific circumstances.
