Engine blocks 3790721 and 3791362 - Chevy Nova Forum
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Old 27th-November-2009, 11:11 PM   #1
II4TheRd

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Engine blocks 3790721 and 3791362

Could anyone tell me if engine blocks 3790721 and 3791362 were actually availabe in 1962 and 1963?
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Old 27th-November-2009, 11:19 PM   #2
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#721 was cast in 1964 #362 in 1965
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Old 27th-November-2009, 11:21 PM   #3
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1962-67 3790721 283 170 220 2 Chevy II
1964-67 3791362 327 250 300 2 Replaced 3790721


first year for a V8 in a ChevyII was '64, so to answer your question... NO, neither engine came in a '62 or a '63 ChevyII.

the 721 which is a 283 (and by that number indicating a ChevyII block) may have come in a '64-'67. the 362 block is a 327 and more than likely was in a '66-'67 ChevyII if that too is a ChevyII block.

on the front pad, by the timing cover and head mounting surface is a series of numbers & codes. can you post all of those numbers & codes so we might help you ID the engines further ?


OR, you can get the numbers and browse these sites and ID them yourself

http://www.nastyz28.com/sbchevy/sblock.php
http://www.nastyz28.com/chevy-engine...ngs.php#suffix

http://www.mortec.com/castnum.htm


i hope i helped,

Johnny
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Old 27th-November-2009, 11:36 PM   #4
II4TheRd

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Engine blocks 3790721 and 3791362

The reason I asked is, in the book "Chevy by the numbers" it shows them available in 1962 and 1963 as a service conversion.Also I've read that you could get a dealer installed 283 or 327.If this is right, what engine blocks were used?
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Old 27th-November-2009, 11:46 PM   #5
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if the pad suffix codes are checked then they might say exactly what those specific engines were originally installed in.

i don't know if there's information that states what V8 would be a dealer installed optional engine especially in a '62. the '63 i could see a "possible" 283 dealer installed V8

the 327, is it in fact a ChevyII block ? if it is then it's possible too i guess as being a dealer installed but like i said, the suffix codes will say what those engines were originally home in.

examples, scroll and check codes (right side) application (left side): http://www.nastyz28.com/gm-chevy-cod...-suffix-10.php
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Old 28th-November-2009, 11:51 AM   #6
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Gerry,

I remember in the late 60's & 70's you could take your Nova to Chevrolet and have a V8 installed still. They had all the factory parts in those times availible, any thing is possible.

Mark
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Old 28th-November-2009, 12:38 PM   #7
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But you could get a v-8 in your nova dealer installed after 1964 it was offered in 1964 as an option therefore it would be after 1964.....
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Old 29th-November-2009, 05:09 PM   #8
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Although 721 blocks were first available in the 64 model year, if you are asking actual dates, you will find 721 blocks that are cast in 63. The one I'm putting in my 65 Acadian is cast in December 63.
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Old 29th-November-2009, 05:12 PM   #9
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Also, most charts show a 721 block as being a 283. However, there are likely some 721 blocks that are 327's as well. I believe there was someone on here recently with a 65 SS 327 that was an original and it has a 721 block.
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Old 29th-November-2009, 05:52 PM   #10
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In Late 62, there were calls by customers that they wanted a V8 option in the SS models they were ordering. Because it was not a Factory option, and the demand was good, but not enough to change the factory line, GM made it a dealer option for 1963. Some 62's were done, a handfull, but in 1963, there were about 800 cars changed over. Most cars were changed to 283's, but you were able to order a 327 also.
I know of two cars that were made in Oakland, that were changed to the 327 fuel injected engines that were for the corvettes. Because the factory classified a dealer option on this, it is classified as a stock car, if you had this opton done "BEFORE" the car was driven.
Hope this info helps.....
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Old 29th-November-2009, 08:30 PM   #11
II4TheRd

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Engine blocks 3790721 and 3791362

Do you have any idea what engine blocks were used and where to find more of the information about the number of 62 and 63 283s and 327 engines that were installed?I'm very interested in getting as much information on this as I can.
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Old 30th-November-2009, 06:03 PM   #12
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Quote:
Originally Posted by Gerry View Post
Do you have any idea what engine blocks were used and where to find more of the information about the number of 62 and 63 283s and 327 engines that were installed?I'm very interested in getting as much information on this as I can.
Gerry,
Hope this helps....
283's..
3849852 1958-64
3789935
3864812 1962-64
327's..
3959512 1962-63
3789817
3794460 1962-64
the upper #'s are the most common used for 1962-63
if you can find a fuel injected engine (original) with the casting #'s of
37882870 or 3858180 then you've struck gold. that 327 engine put out 375 HP, and was a dealer option for those years....but good luck...very hard to find.
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Old 30th-November-2009, 08:43 PM   #13
II4TheRd

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Engine blocks 3790721 and 3791362

That's interesting.
I've always liked the 327 engines,so I'm building my 63 SS conv to reflect one that had the dealer installed 327.I'm trying to make it as period correct as I can.I've got a rebuilt engine with a 3782870 block that was assembled Monday Dec 10,1962.My car was assembled the same week (12B= 2nd week of Dec). The block has a suffix code of SA which means that my engine was originally installed in a full size chevy with a powerglide and ac.I suppose it would be difficult to get much closer than that.
I've only had my Nova for a couple of years so I've got more to learn and research for this project.I've got articals telling of all of the components used for the 327 conversion and a lot is shown in the assembly drawings.
Your comment about there being about 800 63 novas having 283 and 327 engines installed interest me.Would you happen to have any articles with this information?I sure appreciate everyones help.
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Old 1st-December-2009, 07:38 PM   #14
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Quote:
Originally Posted by Gerry View Post
Your comment about there being about 800 63 novas having 283 and 327 engines installed interest me.Would you happen to have any articles with this information?I sure appreciate everyones help.
Gerry,
I did see an article about this a long time ago, and if I find it, I'll post it.
You've got a good block there to use, and period correct. Let us know the progress and some pics, as I have a 63 SS, and like to see different jobs done.
Later....Peter

P.S. there is no way of knowing an exact number of cars that were done, because back then, the dealers could "deal" a little better than they can now, with the computer age....
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Old 1st-December-2009, 09:33 PM   #15
II4TheRd

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Engine blocks 3790721 and 3791362

Thanks Peter for all of the info.I'll put some pictures on this site when I get my car back together and looking presentable.
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