Block number decoding - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gray Ghost · 11-26-2004, 01:18 AM

I got these codes off the truck block in my C-20 and went to Mortec to decode....they have no numbers that match these and no link to anywhere that does. I would like to find out where this motor came from so I can decide better what to do if the block has issues when I get the thing torn down (like bad rings, etc.). For those who don't know, I had a head gasket go bad on me this week.

Here are the numbers....can anyone decode them? These were found at the front left of the block under the alternator bracket.

16R409392
TO905CMJ

Thanks, Kelly

11-26-2004, 01:18 AM	#1
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Block number decoding I got these codes off the truck block in my C-20 and went to Mortec to decode....they have no numbers that match these and no link to anywhere that does. I would like to find out where this motor came from so I can decide better what to do if the block has issues when I get the thing torn down (like bad rings, etc.). For those who don't know, I had a head gasket go bad on me this week. Here are the numbers....can anyone decode them? These were found at the front left of the block under the alternator bracket. 16R409392 TO905CMJ Thanks, Kelly __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps.

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