I would use the CDR for the HD intake and do a blow-by test. I don't think it would be a good idea to try and plug off one of the ports. here's a link to heath diesel on how to do the blow-by test and check the CDR. its for the 6.5 but works on the 6.2 as well.
Heath Diesel Performance Blog

 

am really thankful for the help and the heath site is really useful, because am living out of US, and have no idea about these things only what I know by experience and the net.

 

no problem I'm glad to help. where do you live at?

 

Im from Kingdom of Bahrain its an Island in the Persian Gulf. am sure you heard of it.

 

Actually I haven't but I'm assuming in the middle east... I'm not to Keane on my world geography. But I do agree that the web proves its self useful in this aspect, I'm familiar with these Detroit diesel's and a diehard Chevy man but I didn't know about the blow-by test until I read it on the heath site. Just goes to show you learn something new everyday.

 

yeah it's in the middle east exactly near to Saudi Arabia, and the blow-by test is a new thing I learned too its so easy, am working slowly on my truck in my free time.
this truck was brought from Japan via Dubai and really it has low mileage and super clean.
in our country people are not familiar to diesels because they like gas cars only but I do.its totally new thing for the people in Bahrain.