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Re: 1986 Suburban 7.4L EGR...Backpressure or ported
Posted to Technical Discussion Forum on 2/21/2006

Hi Duane,

I have run into this as well on a truck I was looking at on Vancouver Island. It was a 7.4L v8 equipped with a NON-BACKPRESSURE style egr valve (origninal, in place from the factory).

As you reported, when you look at the partnumber on the valve,... Login to read more.