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02-25-2019, 11:19 AM
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#1 |
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Registered User
 
Join Date: Nov 2018
Location: Indianapolis
Posts: 130
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Engine verification
Finally got the truck in the garage. I am looking to verify the engine. Had to sand the numbers to get a good picture of the stamp. I looked up the letters CKN and found on a Chevelle sight that shows block as made in 1970, 330 hp, 402, TH400 transmission. I did not fine serial numbers in this spot. This is passenger side, front of block. Near where heads attach.
Can anyone verify this? I am not sure I looked it up right. But the block does look to be the original, my truck is a 1971 GMC C3500. I also have a picture of the SPID. Are the serial numbers on this truck on back of block? Just looking to know more about the truck. |
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02-25-2019, 11:48 AM
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#2 |
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Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: Engine verification
T - Tonawanda Plant
07 - July 2 - 2nd day of the month CKN - 1970 Chevelle 402 What is the code in your glove box?
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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02-25-2019, 11:58 AM
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#3 |
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Registered User
Join Date: Nov 2018
Location: Indianapolis
Posts: 130
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Re: Engine verification
This is SPID
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02-25-2019, 06:08 PM
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#4 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,292
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Re: Engine verification
Quote:
 I have a Tonawanda plant TKB (1971-72 truck), built 04-26...Technically a 71 in my case
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 02-25-2019 at 11:55 PM. Reason: Removed link |
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02-25-2019, 11:07 PM
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#5 |
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Registered User
Join Date: Sep 2006
Location: eastern Washington
Posts: 29
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Re: Engine verification
I believe Big Dave is correct. Engines of that vintage which were installed in the factory were stamped with a partial VIN of the vehicle in which they were installed. If there is no partial VIN stamped in the block deck, the engine was sold by Chevrolet for use as a replacement unit.
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02-25-2019, 11:32 PM
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#6 | |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,591
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Re: Engine verification
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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02-25-2019, 11:47 PM
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#7 | |
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Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,292
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Re: Engine verification
Quote:
On another note, I didn't know a 71 402 had 100 more HP than a 72. I remember hearing it had a different timing chain, don't quote me on that.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 02-25-2019 at 11:56 PM. |
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02-28-2019, 12:38 PM
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#8 | |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,357
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Re: Engine verification
Quote:
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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02-25-2019, 12:00 PM
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#9 |
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Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: Engine verification
Looking around, I think the factory engine in your truck would had been TKA or TKB.
http://www.nastyz28.com/gm-chevy-cod...-suffix-15.php
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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02-25-2019, 12:10 PM
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#10 |
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Registered User
Join Date: Nov 2018
Location: Indianapolis
Posts: 130
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Re: Engine verification
I agree, the truck was bought in 1971 in California. I was given the sales receipt. The truck went to the son of original owner. He brought it to Indiana. He drove in the '80's. He is the one who cut dash to add a DIN stereo. He put in shag carpet. Truck has been parked in yard for last few years. That owner passed truck to his son, who is in college. He did not have interest in restoring it. I bought it in November for $2700.00. I am surprised that the engine was changed. It runs great.
Thanks for the information Jerry |
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02-25-2019, 01:11 PM
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#11 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Engine verification
It does seem like a Chevelle engine of that vintage would have had a partial VIN.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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02-25-2019, 01:46 PM
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#12 |
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Moderator
 
Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,204
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Re: Engine verification
CKN denotes 1970 Chevelle 330 hp engine with a TH400 trans....L43 option
Your SPID show L47 engine code...400 cu in with TH400 trans..... There were some trucks built that used the L43 engines in place of L47....supply issues I believe.... or it could have blown the original engine and had this Chevelle engine installed....maybe just luck that the engine is also a 1970 issue,,,,
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox 
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