3790721 Block - Chevy Nova Forum
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Old 13th-May-2012, 12:45 PM   #1
CRJ

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3790721 Block

Hey guys, just picked up a 721 engine yesterday. I need help with the codes. The info on the block is as follows.. Cast date is I243 whick I believe is Sept. 24, 1963. The Stamping on the front pad is FI002DE which I think is Flint Michigan plant. Assembly date of Oct. 2 1963 and DE is 1964 Nova with powerglide. I dont have any decoding books so this is the best I could come up with. Any help would be greatly appreciated. Thanks! Chuck
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Old 13th-May-2012, 01:24 PM   #2
BZ65

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Try this: http://novaresource.org/index.htm
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Old 13th-May-2012, 02:39 PM   #3
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Quote:
Originally Posted by CRJ View Post
Hey guys, just picked up a 721 engine yesterday. I need help with the codes. The info on the block is as follows.. Cast date is I243 whick I believe is Sept. 24, 1963. The Stamping on the front pad is FI002DE which I think is Flint Michigan plant. Assembly date of Oct. 2 1963 and DE is 1964 Nova with powerglide. I dont have any decoding books so this is the best I could come up with. Any help would be greatly appreciated. Thanks! Chuck
Not much to add to the correct information you've indicated above. The 721 was the primary block used for the 283CID 1964 Chevy II. Later it was used for Chevy II 327 applications until the 362 block came along in fall of 1965. Even some very early 1966 L79s had 721 blocks.

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Old 15th-May-2012, 11:09 PM   #4
tburgchevy

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So is the 721 block a 283 block or 327 block?

Frank
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Old 15th-May-2012, 11:56 PM   #5
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Chevy II specific block used for both 283 and 327. Different size cyl. bore.
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Old 16th-May-2012, 12:27 PM   #6
CRJ

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Thanks for the info guys, I just tore this thing down. Looks like the block is at .030 over but it had a fresh rebuild. I still see crosshatching on the bores. Im taking the block in to my machinist to have it checked out. Ive had severeal 194 blocks thru the years and still have one in my 63 coupe but this is the first 721 Ive had. I paid $400 for it from intake to pan including the Nova specific exh. manifolds. He even thru it an extra intake that turned out to be for a 1960 corvette 283. This engine is slated to go into my SS vert.
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Old 16th-May-2012, 12:44 PM   #7
CRJ

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Also, since this is the same casting as the 327 ,can this block be safely bored out to 4 inches? Im not finding anything concrete about that. I dont want to make a 327 out of it, I just want to know if I have much more room to play with if the block needs anymore cyl. work:
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