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“Vicky (totalled & shredded)”/
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supermotors.net/registry/media/173190
The semicircular groove at the back of the intake journal is the…
Engine Donor & RemovalView all 117
The semicircular groove at the back of the intake journal is the groove for the EGR, which is packed solid with exhaust soot. It sets a code for "insufficient EGR flow" and can cause the engine to run hot, or even damage the pistons, so it has to be cleaned periodically. Engines with a plastic intake don't suffer from this.
See this pic for the PN for the gasket.
http://www.supermotors.net/vehicles/registry/media/190433
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