Re: COPO 3963512 block. No VIN#
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The use of the 3 letter code began with the 1970 model year. This included the blocks and the rears.
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But 69 Camaro had an extended model year. The later axles were 3 digits and some BB's were too. I have a service bulletin: 400 (meaning 402) engine released for 1969 Camaro. They talk about the 3 digit BB codes. I need to scan it soon.
But I've not seen a COPO with a 3 digit code.
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Kurt S - CRG
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