Re: I've never seen this before
It's obvious I don't know anything about the diesel engines. I saw the v6 valve cover and knew they had a big 478 gas engine and jumped to the wrong conclusion. I thought the cover tag read OH-478, but after the last much more knowledgeable posts I found the DH-478 on 6066 GMC's web page.
http://6066gmcguy.com/toroflow.html
Very cool. Thanks
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'67 GMC 2500, 292, 4spd, AC
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