can you bore a 283 block out to a 4" bore ? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-30-2007, 12:49 PM
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can you bore a 283 block out to a 4" bore ?

I have a question about a 1957 to 1966 283 block, the casting is # 3849852. this is in a rebuilt 69 swb chevy p/u frame I'm looking at, I only want the frame but was curious about the engine. the guy says he rebuilt the engine and took the 283 block and bored it to a 4" bore and put a 327 crank in it making it a 327cid engine. is this possible to bore a 283 to a 4" bore ? thats going from a 3.875 bore to a 4" bore.

it has a an 8" Summit externally balanced balancer, were the 327s
externally balanced ?

the motor has Summit brand Dart Iron Eagle heads. Comb Chambers: 72cc and a alum intake no carb. motors never been started.





thanks

Mustangsaly

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Old 04-30-2007, 12:52 PM
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Very few and only specific years (late 50's) of 283's can reasonably be bored to 4". Most will not go that far without serious problems.

Vince

Last edited by 302 Z28; 04-30-2007 at 01:10 PM.
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Old 04-30-2007, 12:55 PM
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That's .125" over. If he successfully did it without hitting water, the block is probably useless.
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Old 04-30-2007, 03:19 PM
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Yes!

Back in the Sixtys one popular engine mod was to bore out a 283 block to 4 inches and have a 301 (using the 283 crank). This was risky, but many blocks were bored and ran strong for that day. Infact I had a 301, dual quads and a Corvette close ratio 3-speed in a '55 Chevy that I raced for several years with only minimal overheating on the street.
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Old 04-30-2007, 04:39 PM
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this guy had one michine shop bore it to .60 over then when he got the 327 crank he had another machine shop to over Bore w/Torque Plate from .060 over to .125 over.






Mustangsaly
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Old 04-30-2007, 06:22 PM
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283 bored to 4"

That externally balanced damper is a BIG red flag for me. Unless the owner can specifically tell you what he did to the motor, you don't know what is inside without tearing it apart, some 283's can go .125'" over as stated by others, more common way back when there wasn't anything bigger, but that balancer means that there is a 3.75" stroker crank inside(unless the parts don't all match). BUYER BEWARE on this one, probably a good thing that motor has never been started.
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Old 04-30-2007, 06:39 PM
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I seem to remember clearence issues with putting a 327 crank into the 283 blocks; no problem with the other way around as long as they are both small journal. And before anyone says anything, the 307 blocks were all large journal and designed for the 3.25 stroke 327/307 cranks. I think someone's just talking to hear himself talk on this one. The balancer/dampener does'nt make sense.
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Old 04-30-2007, 06:52 PM
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From my SBC book here is what I am getting:
Early-era 57 283 60 over max.
Mid-283-era 58-62 good to 4.00(When brand new) but with age and rust on walls not a good idea.
Last-283-Era 63-67 60 over max.
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Old 04-30-2007, 06:58 PM
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Quote:
Originally Posted by junior stocker
I seem to remember clearence issues with putting a 327 crank into the 283 blocks;
You are right about that!
This also from SBC book:
The author says "In essence, all the principal dimensions were the same. The biggest change was the underside of the block where the bores meets the crankcase area. This was relieved to clear the 327 CID crank's longer stroke"

David Vizard
HP Books
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Old 04-30-2007, 08:24 PM
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4''

Back in 58 we were going thru blocks in our fed. some would split, others had rod troubles. On the 283 in my dragster, the block is poured, and has the 4'' bore. it runs alky and there isn't a problem. fingers crossed.
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Old 05-01-2007, 12:39 PM
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Quote:
Originally Posted by junior stocker
I think someone's just talking to hear himself talk on this one. The balancer/dampener does'nt make sense.


what do you mean ? who wants to hear them selfs talk ?

heres the auction
http://cgi.ebay.com/ebaymotors/69-Ch...QQcmdZViewItem

heres his cost and it shows the over bore
http://www.funkymule.com/garage/cost.aspx



this is what he said when I ask him about the 4" bore

the 283 and early 327 block (68 and earlier i think) were the same cast. the 283 is a 3.875 bore and a 3.000 stroke. the small journal cranks were used in 327s (either 67 and earlier or 68 and earlier). the crank that i used is from a 67 camaro with a factory 327 small journal block. i had to pay extra for the machine shop to bore this over because i had to take so much metal out of the bore. but it was in fact a 283 with a 3.875 bore that was bored to a 4.000.



the whole thing worries me anyway, none of it is done my way and he wants more than I'm willing to pay for it. and he has to much $ in it too sell cheap, unless he changes his mind. he spent $1500 on a front disc brake upgrade and keep the 6 lug pattern, witch is ok, but not what I have planed for my project. I'm wanting a 5 lug setup. I have a 72 c10 with disc brakes. I was/am looking for a cheap frame thats finished. but this isn't it.




Mustangsaly
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Old 05-01-2007, 01:51 PM
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On second thought, after reading his story, and very detailed discription of his project, he would have been better off to have said, "it's got a completely rebuilt 327 in it with XYZ performance parts added". As long winded as it is, I still think he likes to hear himself talk. Nuff said!
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Old 05-01-2007, 02:35 PM
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junior stock you read his whole page ? cause something ain't right with a lot of it imo.

http://www.funkymule.com/garage/journal.aspx


rearend rebuild scares me too !
http://www.funkymule.com/garage/journalentry.aspx?id=10

While the diff. cover was off, the filter on my shop vac blew as I was vacuuming sand blast media. The damned media got all up in the ring gear. I was rotating the ring gear to see how much media got where (remember, I pulled the pinion rod out), when the side gears fell. After about an hour of trying to get both side gears lined up, I was able to get them in line and replace the pinion rod. Anyway, I'm going to have to clean out the whole housing before filling it again.


his engine rebuild scares me too. but I'm only wanting a rebuilt frame (I need to rebuild mine instead of looking for a easier solution ) and his has no ps.


Mustangsaly
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Old 05-01-2007, 03:02 PM
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A lot of shaky things he talks about on there.
I would also be concered with the cleaned and not rebuilt saginaw. I would think any stout V8 could tear it up, unless you just spin the wheels and never hook up it may live longer. I thought about keeping my 3 speed from the inline six but I have heard too many tales of mass breakage once a hipo engine is put in front of it.

And this gem "there is plenty of wall left for a few more bores." and "That casting code was used on 1964-1968 283 and 327s."

That contradicts whats I have read from 2 decently credible sources on what you can do with the blocks of the last 283 casting era.
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