AJMBLAZER

CDR valves are important but unfortunately not supported in the aftermarket and GM wants an arm, a leg, and something else (or two) for them.

These should be replaced every 50k according to GM (correct me if I'm wrong) but the diesel gurus seem to agree that much more frequent intervals are better. However it seems like they aren't common in the aftermarket as a replacement part. Pretty much the GM/AC Delco route is the only one any of us could find in my CDR thread.

The correct GM part number for the military spec'd part is 25042462 with AC Delco calling the same part the CV871. The part listed for a 1986 Chevy K30 6.2L civilian truck is a 25042248 in the GM parts book and a CV870 according to AC Delco. GM and EVERYONE else list the military spec part as obsolete and it's a dead end. The civilian part could not be located at NAPA, Advanced Auto (Kragen/Schucks/Shumers), Auto Zone, CarQuest, and two local places here in Traverse City, MI. The only locations I personally could find them were my local GM dealers at $71 each and www.Rock-Auto.com for about $41 delivered.

I have a feeling these are becoming a rare part as the box I received is definitely old having the older AC label on it and the date code on the box being from 1997. Others have alluded to getting the part from different suppliers but I haven't tracked this down. I'd definitely consider mine NOS.

The civilian part bolts right to the CUCV's mount and the hoses hook right up to it. Mine had a slightly different angle on the pipe that curves out and away towards the front of the truck but it might just be a manufacturing deviation and didn't pose any sort of problem.

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89 Chevy K5 Blazer. 6.2L diesel, stockish, and clean.

These opinions and thoughts moderated with your sensibilities in mind.

Sold my CUCV and won't likely be back. If you want a good forum with excellent knowledge of 73-87 GM trucks where folks won't judge you for modifying YOUR vehicle, please join us at www.ColoradoK5.com .

Oh, and don't EVER buy anything from Alfa Heaven. Do a search.