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<blockquote data-quote="57chevythunder" data-source="post: 20611" data-attributes="member: 4881">I believe it is orifice (or restrictor) sandwiched between the cylinder head and engine block. And as such, I think there is nothing about it that should require replacement.On the other hand, there are a couple of &quot;fresh air&quot; valves in the circuit, one on each bank of the camshaft case. And heads of the fasteners on those two parts VERY DIFINITELY have a totally unconventional recessed pattern. -I think they are under the category of &quot;one time use.&quot;&nbsp; Yes, it would be interesting to see what an experienced dealer service technician would have to say about it. I also see a line that connects to the turbo-charger and runs to a fitting on the rear bank of the camshaft case.I remember reading somewhere about the design and operation of the crankcase ventilation system on this engine. There are two distinctly different modes of operation, depending on whether the engine air intake manifold is operating under vacuum, no turbo boost, or under pressure with turbo boost active.The bottom line to me is that this is not the simple PCV system that we have all been used to for decades.It seems to me that the crankcase ventilation components of this engine certainly do not fall under the category of ordinary &quot;service&quot; items.&nbsp; -sort of like, &quot;its probably not malfunctioning, so it doesn't need servicing.&quot;Anyway, that is just my observation and opinion. Hope you get better answers.</blockquote>

[QUOTE="57chevythunder, post: 20611, member: 4881"] I believe it is orifice (or restrictor) sandwiched between the cylinder head and engine block. And as such, I think there is nothing about it that should require replacement. On the other hand, there are a couple of "fresh air" valves in the circuit, one on each bank of the camshaft case. And heads of the fasteners on those two parts VERY DIFINITELY have a totally unconventional recessed pattern. -I think they are under the category of "one time use." Yes, it would be interesting to see what an experienced dealer service technician would have to say about it. I also see a line that connects to the turbo-charger and runs to a fitting on the rear bank of the camshaft case. I remember reading somewhere about the design and operation of the crankcase ventilation system on this engine. There are two distinctly different modes of operation, depending on whether the engine air intake manifold is operating under vacuum, no turbo boost, or under pressure with turbo boost active. The bottom line to me is that this is not the simple PCV system that we have all been used to for decades. It seems to me that the crankcase ventilation components of this engine certainly do not fall under the category of ordinary "service" items. -sort of like, "its probably not malfunctioning, so it doesn't need servicing." Anyway, that is just my observation and opinion. Hope you get better answers. [/QUOTE]

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