weird engine manufacture code

[70CitrusZ]

Very unusual. Interesting that the codes are different, I just can't help wondering why the factory would use a different code than regularly used....I wonder if the "3T" code was for close ratio trans, because we have two wide ratios known with "3S" designation?.

[3macs1]

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Very unusual. Interesting that the codes are different, I just can't help wondering why the factory would use a different code than regularly used....I wonder if the "3T" code was for close ratio trans, because we have two wide ratios known with "3S" designation?.

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I thought it may have something to do with one came out of a impala and one out of a pontiac but I don't know. For what it is worth the 3T was a close ratio 4 speed.

[ASTROJET]

The car I mentioned is not mine,but is still with the original owner.Hey 3macs,tell me more about that '68 Pontiac.

[DM69SS]

I have a 427 that has an odd stamp as well. I could never really find any information on it. The general consensus seemed to be that it was a marine application or something like that. The engine is a low mileage 512 block, std everything, that has all the guts of an L-88. 7115 crank, 7/16 dimples, etc. I'm not trying to hijack the thread, but thought I would post a pic of it.

[image]http://www.flickr.com/photos/dmleonard/829916918/[/image]

[DM69SS]

Sorry guys, not that good with pics. Or just use this link:
http://www.flickr.com/photos/dmleonard/829916918/

[PeteLeathersac]

[ QUOTE ]
Sorry guys, not that good with pics. Or just use this link:
http://www.flickr.com/photos/dmleonard/829916918/

[/ QUOTE ]

Another interesting one for sure and not included in the regular 'known' Marine or Canadian suffix listings?.
Take note the Tonawanda build is 0325 so the suffix should be the '7BL' not the BL alone?.

On the other unknown suffixes, TAR6569 are you saying these Flint plant engines were Mk1V's or Small-Blocks as I always understood Tonawanda was the only source for MK1V's?.

As a side note on small blocks, don't forget Canadian-Hamilton built 65/66 Studebakers had McKinnon sourced SB Chevy engines after South Bend closed.. I forget if they're numerical or not but they occasionaly pop up as a loose SB..

In most Canadian numerical suffixes I recall seeing, the rest of the plant and build number is 'normal' and unlike Ander's example?.

As mentioned previously I have an old Canadian book (not a GM publication) that lists lots of the numerical suffixes but not the previous examples...have to look again for the recent additions?.

Nothing to do with it but interesting to note how Canadian assembly plants have a numerical designation too, unlike US plants which have a letter...Oshawa vehicles always had a number 1 in the Vin..

Again, anyone have recent contact info for ex Tonawanda plant Chevy guy Fran Preve?. I haven't spoken w/ him in a few years but he once told me he had saved what was left of internal documents when they were being tossed and may have some more info on these unknown suffixes?.

~ Pete