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**MusicMan70** · 05-29-2012, 11:01 PM

Hey Erik,

Not sure what the number means, but this was on my 401M that I got. I have asked on the 6066 site, but they are stumped as well.

05-29-2012, 11:01 PM	#4
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,852	Re: GMC V-6 casting number help Hey Erik, Not sure what the number means, but this was on my 401M that I got. I have asked on the 6066 site, but they are stumped as well. Attached Images __________________ MusicMan70 1961 GMC Suburban