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Username Post: 409 block codes
Frequent Contributor
Posts: 1094

Age: 61
Loc: Grande Prairie AB & N...
Reg: 09-22-14
09-26-21 11:02 AM - Post#2827994    
    In response to space66

For block date codes "I" is September which would have to be 1964 for that block part number because the 409 was replaced in February 1965.
Oshawa had the 409 available through the whole 1965 production year since the 396 was not available to that plant, but I don't think McKinnon cast 409's.
My 283 is a McKinnon cast block though.
The only way that could be a September 6th 1966 casting is if service blocks were still being produced.
No idea if that was done or not.

65 Impala SS Evening Orchid convertible 283 2V with Powerglide and 10 bolt 3.08 open by PO, originally 3.36
Build date Dec. 21 '64 Oshawa

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