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Pete,
Do you have a copy of the GM docs for that car? I've never seen a suffix like that 3T one before. 68 4 speed L36 codes were IE and IH. This info would have been stamped at Tonowanda..
Steve
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Check your emails Steve as I'm forwarding the complete Canadian documents for the '68 SS427 L36 car I used in my example..
Your comments are on the ball and exactly why I've been preaching these Canadian suffixes for years but few have ever seemed to care...or understand what I've been blabbing about?.
And to clarify, the example is not a stamping mistake or a one-off situation as many Canadian cars had different Alpha Numeric suffixes plus lots of unique Numeric-Numeric suffixes exist too!.
Something I've always thought interesting w/ a mixed Alpha/Numeric suffix too but reversed w/ the Alpha first instead of the Numeric first like the Canadian code above is the Gibb Nova E3 Suffix..
Does anyone know of more mixed Alpha/Numeric suffixes w/ the Alpha first like the Gibb cars had?.

~ Pete
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I like real cars best...the REAL real ones!