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Discussion Starter #1
Could someone out there with a November or December 1965, or January 1966 built original 1966 327 Nova please let me know what the casting # is on your engine block?

Thanks,

Steve G.
 

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My 1966 L79 had a 362 block. The engine date was Nov 3, 1965, and the car was built November 25th, 1965. The 721 block can be found in many of the 1966 cars built in fall, 1965. The change to the 362 block came sometime after the end of October, but there are instances of November/December cars having 721's.

Bob
 

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Other than the part numbers are there any other differences between the blocks?
 

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blocks

the 721 block is the same as the first 362 blocks, but the later 66/67 362 blocks have a different casting around the front that lines up with the vent tube area of the intake that is not shrouded. My first car was also built in Nov 66 and had the same FII03ZI as Bobs' car, and my car I have now is the same number as another one in the registry F0II8ZI , and the ones were indeed "I" s in both cases. I have 4 blocks in my possesion right now, all 362 and they are mid year 66 and one is june 67 that is different as described. Frank
 

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Discussion Starter #5
I guess I came to the right place to ask that question. Thank you both very much!
In my research I found the last 721 blocks were cast in October of 65 and the first casting of the 362 block was September of 65. One month overlap maybe to chase the flaws out.
I didn't think that the remainder of the 721 blocks lasted into January 66.

Thanks again,

Steve G.
 

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In my research I found the last 721 blocks were cast in October of 65 and the first casting of the 362 block was September of 65. One month overlap maybe to chase the flaws out.
I didn't think that the remainder of the 721 blocks lasted into January 66.
Thanks again,
Steve G.
I have GM Canada paperwork on a '66 built 9 weeks after the documented engine code date. This would be the exception, but these kinds of things happened in the 60's.

Bob
 

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dates

Bob, in the Canadian Registry, and the documents we have gathered there are quite a few duplicate engine build dates. I have a list of casting dates and pad stampings( if still there) of 362 and 721 engines that have been for sale over the years, and most are very close, with the exception of later in the year build dates.
 

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This isn't quite a December casting. Here is another to add to your list. 3790721 block, cast I255, assembly stamp FI00IZF. A 283 block 3959534, cast C289, stamp CE122098. Still going strong in 69.
 
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