11-26-2004, 01:18 AM | #1 |
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Join Date: Sep 2004
Location: Terrell, TX
Posts: 1,967
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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
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Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. |
11-26-2004, 01:40 AM | #2 |
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Join Date: Jun 2004
Location: Lake Charles, LA
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what kind of motor is it i know on my 350 the codes are by the firewall on the drivers side
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11-26-2004, 10:25 AM | #3 |
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Join Date: Nov 2004
Location: Claysburg, Pa
Posts: 408
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Could be a 350 or 305 according to my book you will need to get the back number off the block to be sure
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11-26-2004, 12:20 PM | #4 |
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Join Date: Jul 2004
Location: ashland oh
Posts: 660
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numbers
your gonna need the number's off of back of block like they said..there located on driver's side right at back of block..some are really hard to see,,i have heard of people using like play dough to put down in there and transfer number's,,,also have heard of using tin foil...you get these number's and they will point you where you need to go..good luck
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11-26-2004, 01:42 PM | #5 |
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Join Date: May 2004
Location: Lubbock, Texas
Posts: 2,121
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some times its really heard because off casting flast on the numbers too, its a real pita
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'96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer |
11-27-2004, 06:25 PM | #6 |
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Join Date: Apr 2002
Location: Portland , Tennessee , United States
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good site
this is a good site to find engine numbers. www.nastyz28.com
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11-27-2004, 06:45 PM | #7 |
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Join Date: Sep 2004
Location: Terrell, TX
Posts: 1,967
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Thanks...I got it decoded...1974 350 4 bolt (could be police motor block) in a Caprice/Impala body style. I think I'll keep it....
The numbers off the back of the block don't tell ya much....3970014 = 2-4 bolt 350 70-76...not much info there.
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Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. |
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