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john_engel's avatar
john_engel
Explorer
Jul 14, 2016

Header Installation - Abandon EGR Tube? - Acetone?

Hello all, I just installed a set of Thorley headers on a Chevy 454 7.4L to fix leaky stock manifolds, great solution! Performance is awesome!! My only issue is that the new headers don't have ...
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RLS7201's avatar
RLS7201
Explorer II
Jul 14, 2016
The EGR valve was installed to lower combustion chamber temperatures, which reduced the formation of NoX. Then the ignition timing was advanced to help compensate for reduced performance. With NO EGR and advanced timing, there is a chance of burning a hole in a piston.

Richard

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