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Discussion Starter #1
Hi all. I was wondering if someone could help me with the numbers that I found on the block under the alternator area on my 1970 Elky SS 396. Here are the numbers 0013T0408CTW. The 3 was very lightly stamped so it could be a 3 or possibly an 8 or maybe even a 6. From what the original owner told us, it was a NOS warranty long block that was put in when the original block went bad.

Any help in decoding it would greatly be appreciated since the books that I have do not have any listing for these numbers.
 

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T0408CTW

T = made at the Tonawanda Plant
04 = Month = April
08 = 8th day of the Month
CTW = four possibilities

1970 CTW Chevy II 396 350HP
1970 CTW Chevy II 396 375HP
1970 CTW Camaro 396 350HP
1970 CTW Chevelle 396 350HP

Source: NastyZ28.com

:mrgreen:
 

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Discussion Starter #3
87Elcamino,

This engine is in a 1970 El Camino SS 396.

What does the 0013 number part of the stamping mean?
 

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CTW=Turbohydromatic 400, High Perf.....Thats for a 350 HP 402 in a 1970 Chevelle/El Camino. I replied to this post earlier in the vin decoding section. You never answered it. 402's were called 396's

In 1970, there were two different SS packages available. One was the "Z25" SS-396 and the other was the "Z15" SS-454. There were only two engine choices for the SS-396: the 350 and 375 horsepower versions. It was a confusing year for 396 buyers. The 396 engines now actually displaced 402 cubic inches, but were still called a "396" when installed in an SS. There was also a new 330 horsepower "LS3" big-block "400" engine option available for the non-SS Malibu and El Camino Custom. To confuse things even further, there was a 400 cubic inch 2-bbl small-block available (only in the '70 Monte Carlo).

The Malibu "400" big-block was also actually a 402, and was basically an overbored version of the 325 horsepower 396 motor that had been available on the '68 and '69 SSs. The "Malibu 400" package, produced from '70-'72 on the Chevelle and El Camino is fairly scarce today. The reason is that many of these big-block vehicles have been converted to SS clones. In stock form, the Malibu 400 and El Camino 400 carried "400" emblems on the fenders........
hope tis clears things up for ya 8)
 

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Discussion Starter #6
elky72ss454,

thanks for the info. That part of the engine decoding I was able to get from some of the sources I have home. The main problem I was having was with the set of numbers (0013).

What do these numbers stand for?
 

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elky72ss454,

My 72 Elky is the 400 Custom with the 400 emblems on the fenders.

Package included, in mine, the Bucket Seats, factory A/C, Console, 3 Speed floor shift 400 Th, 12 bolt Posi, Dual Exhaust, Vinyl top, HD Springs and Towing package. It was exciting, to me, when it was offered. I only had to go pick it up.

As best I can tell... the only real difference between this one and the SS was the dash. Mine does not have the gage package added, the Cowl hood, I think was actually optional on SS, and of course the emblems.
 
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