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The deposits from combining EGR and PCV are almost all from the EGR. In the 76 280 Z I had long ago there was no EGR and it came from the factory that way in Federal emissions form. It also had no catalytic converter.
The inside of the manifold had a light broown tint from the PCV, but without EGR there was absolutely no buildup.
Glad to see you are still here dusty, looks like you are getting something worth reading.
Not my field of expertise, I'm chasing different pathways.
regards
Mech
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