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Username Post: 409 block codes
"4th Year Gold Supporting Member
Posts 289
09-22-21 12:10 PM - Post#2827702    

The left rear block #3857656 dates it 64-65. The right rear # is 166 or I66. Did they use julian dates then which would make the 166 June 15th or is the I66 still missing a number?


1965 Impala SS

Posts 727
09-26-21 09:29 AM - Post#2827990    

most probably it's #166, I66 , the last number would be #5 for 1965 not #6 ,would mean 1966, if any 409 in 1966 (not) ?

My first car: 1970 Olds, 442,455
My last car : 1966 Chev. Impala convertible,396
current car: Can't afford them anymore ...

Frequent Contributor
Posts 1094
09-26-21 11:02 AM - Post#2827994    

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

Frequent Contributor
Posts 1215
10-09-21 07:44 AM - Post#2828859    

166 would be the Julian date code. Would make it a very early 65 model year block
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