Quote:
Originally Posted by Eddie H.
I have been running a non EGR SB 400 with an Edlebrock carb and manifold for about 20 years without any problems. The only purpose for an EGR valve is to reduce NOX emissions. Unless your truck needs to be emissions tested to pass inspection, you don't need it.
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Almost, yes it does reduce NOx, but in doing so it reduces the combustion temperature which can cause pinging, especially under load. So depending on how the engine is built and how it is driven, who's to say. If you are going to have a built 400 and run a large carb and weekend drive it and run premium fuel, I'd say no. If it is a mild build and you plan on towing a travel trailer and daily drive it I'd say yes.