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Old 10-13-2006, 12:13 AM
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Chevy 283

I just started tearing down a 283 out of 1967 car and I noticed that the harmonic balancer doesn't have a bolt it on and there isn't a threaded hole in the crankshaft so I took it off with my puller....so now what do I do when I put it back is there a certain way it goes......... But after all the I have got a reworked set of 305 HO heads to get the compression up...with 550 Lift springs and new valves....and I was thinking about putting a 292 cam in it, but wasn't to sure whether it was to big or not...I was gonna put a 2400-2800 Stall Converter in it to get the car (1980 Malibu) going.
Please HELP

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Old 10-13-2006, 12:19 AM
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Also the crankshaft's number is 3876768...one website says cast and the other says forged?
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Old 10-13-2006, 03:45 AM
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Doc here,

look closely again, I'll bet the bolt is sheared off level with the crank snout..and will require a Shop to fix it..

AND the pulley and snout should have a half moon drift pin to set it right.

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Old 10-13-2006, 05:31 AM
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Lots of 283s, and I have seen 327s, that don't have a bolt in the crank. It's a press fit.....sounds bad, but you bang them on with a hammer and a block of wood. I have never heard of one coming off. If you don't like that idea, get a machine shop to drill/tap a hole for you.
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Old 10-13-2006, 05:46 AM
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i've seen this on a 302,witch the casting # was 3815822 and that was a forged small journal crank used in 265,283,and 302's.
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Old 10-13-2006, 05:49 AM
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Early SBC's did not have a bolt in the end of the crank.

Vince
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Old 10-13-2006, 06:25 AM
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Quote:
Originally Posted by MyMalibu
I just started tearing down a 283 out of 1967 car and I noticed that the harmonic balancer doesn't have a bolt it on and there isn't a threaded hole in the crankshaft so I took it off with my puller....so now what do I do when I put it back is there a certain way it goes......... But after all the I have got a reworked set of 305 HO heads to get the compression up...with 550 Lift springs and new valves....and I was thinking about putting a 292 cam in it, but wasn't to sure whether it was to big or not...I was gonna put a 2400-2800 Stall Converter in it to get the car (1980 Malibu) going.
Please HELP
A 292 cam in a 283 will start working at about 5000 rpm. If you plan on spending most of your time below 5000 rpm, I would look for a shorter cam, much shorter. A 2400 stall converter won't stall a 283 at 2400 rpm, probably closer to 2000 rpm.
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Old 10-13-2006, 07:54 AM
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292H is way too big! Go with the 270H. Should work well with that stall, which will be lower with a 283. Plus you need some torque with that little engine.

Yes, those old cranks don't use a bolt. Just line up the key-way and tap it on with a big hammer and a block of wood. In this case, a lot of small hammer blows are much better than a few big ones.
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Old 10-13-2006, 08:03 AM
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be sure to support the rear of the crank so while you are tapping the balancer on you don't beat against the thrust main.
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Old 10-13-2006, 10:32 AM
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Well I talked to my old automotive teacher and he said a 292 would make it to radical, but also said that a smaller cam in a smaller motor will sound better? I am not for sure and a 270H...I had one of those in my 305 a couple years back and it was ok didn't hit hard. So is it true a smaller cam will sound and run totally different in a 283?
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Old 10-13-2006, 10:37 AM
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Also I finished disassembling it last night crank is pretty clean for being almost 40 years and the same with the pistons....the motor has never been apart.....its still the stock bore 3.875; however, there is a slight ridge in the top of the clyinder which more than likely will have to be taken care of. But did anyone find out about the crank (3876768) b/c some websites say cast and the others say forged?
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Old 10-13-2006, 11:03 AM
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I just finished a 283 for a friend.

We used pocket ported World 305 heads with the small chambers and valves, Lunati 262VooDoo cam and an old 500cfm Carter on Holley dual plane intake.

It sounds mean, and runs pretty good for a little engine.



Larry
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Old 10-13-2006, 11:07 AM
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mortec says forged.post a pic (close up) if you can and the maybe it can be identified.the stuff i've found on mortec has been correct but maybe i've been lucky.you need to look at the throws were there is a casting flash or forging marks.
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Old 10-13-2006, 11:08 AM
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So it hits pretty good...well this guy at our local machine shop offered to supply a set of 305 HO heads and rework them with new valves, retainers, locks, and springs for $150 and I think thats pretty cheap. I was hoping to possibly get between 275 and 325 HP out of it if it's possibly, but it not somewhere close. I will be using a TH350 tranny and what stall would be good for the street. With a 3.55 gear and Auburn Posi.
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Old 10-13-2006, 11:19 AM
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[QUOTE=MyMalibu]So it hits pretty good...well this guy at our local machine shop offered to supply a set of 305 HO heads and rework them with new valves, retainers, locks, and springs for $150 and I think thats pretty cheap. QUOTE]

yeah that don't sound right,if he bought valves for lets say $8 each that would cost $128 and i know valves very in price but nobody is going to loss money for your benefit.
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